Merge pull request #44 from ZouXinyao/main

添加Go语言题解
This commit is contained in:
算法基地 2021-07-29 10:33:16 +08:00 committed by GitHub
commit 5a5325b0c8
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52 changed files with 1679 additions and 104 deletions

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@ -73,3 +73,35 @@ class Solution {
}
}
```
Go Code:
```go
func search(nums []int, target int) bool {
l, r := 0, len(nums) - 1
for l <= r {
m := l + (r - l) / 2
if nums[m] == target {
return true
}
// 先判断哪边是递增的再查找范围
if nums[m] == nums[l] {
l++
} else if nums[l] < nums[m] {
// 判断target是否在有序的那边就行了
if nums[l] <= target && target < nums[m] {
r = m - 1
} else {
l = m + 1
}
} else if nums[l] > nums[m] {
if nums[m] < target && target <= nums[r] {
l = m + 1
} else {
r = m - 1
}
}
}
return false
}
```

View File

@ -104,3 +104,23 @@ public:
}
};
```
Go Code:
```go
func findMin(nums []int) int {
l, r := 0, len(nums) - 1
for l < r {
if nums[l] < nums[r] {
return nums[l]
}
m := l + (r - l) / 2
if nums[l] > nums[m] {
r = m
} else {
l = m + 1
}
}
return nums[l]
}
```

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@ -127,4 +127,34 @@ class Solution {
}
```
##
Go Code:
```go
func search(nums []int, target int) int {
l, r := 0, len(nums) - 1
for l <= r {
m := (l + r) / 2
if target == nums[m] {
return m
}
// 先判断哪边是有序的
if nums[m] < nums[r] {
// 再判断target在左右哪边
if target > nums[m] && target <= nums[r] {
l = m + 1
} else {
r = m - 1
}
} else {
if target < nums[m] && target >= nums[l] {
r = m - 1
} else {
l = m + 1
}
}
}
return -1
}
```
##

View File

@ -166,3 +166,45 @@ class Solution {
}
}
```
Go Code:
```go
func searchRange(nums []int, target int) []int {
upper := upperBound(nums, target)
lower := lowerBound(nums, target)
if (upper < lower) {
return []int{-1, -1}
}
return []int{lower, upper}
}
// upperBound 计算上边界
func upperBound(nums []int, target int) int {
l, r := 0, len(nums) - 1
for l <= r {
m := l + (r - l) / 2
if target >= nums[m] {
l = m + 1
} else if target < nums[m] {
r = m - 1
}
}
return r
}
// lowerBound 计算下边界
func lowerBound(nums []int, target int) int {
l, r := 0, len(nums) - 1
for l <= r {
m := l + (r - l) / 2
if target <= nums[m] {
r = m - 1
} else if target > nums[m] {
l = m + 1
}
}
return l
}
```

View File

@ -1,8 +1,8 @@
> 如果阅读时发现错误或者动画不可以显示的问题可以添加我微信好友 **[tan45du_one](https://raw.githubusercontent.com/tan45du/tan45du.github.io/master/个人微信.15egrcgqd94w.jpg)** 备注 github + 题目 + 问题 向我反馈
> 如果阅读时发现错误或者动画不可以显示的问题可以添加我微信好友 **[tan45du_one](https://raw.githubusercontent.com/tan45du/tan45du.github.io/master/个人微信.15egrcgqd94w.jpg)** 备注 github + 题目 + 问题 向我反馈
>
> 感谢支持该仓库会一直维护希望对各位有一丢丢帮助
>
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
#### [35. 搜索插入位置](https://leetcode-cn.com/problems/search-insert-position/)
@ -52,10 +52,10 @@ class Solution {
//查询成功
if (target == nums[mid]) {
return mid;
//右区间
//右区间
} else if (nums[mid] < target) {
left = mid + 1;
//左区间
left = mid + 1;
//左区间
} else if (nums[mid] > target) {
right = mid - 1;
}
@ -65,3 +65,23 @@ class Solution {
}
}
```
Go Code:
```go
func searchInsert(nums []int, target int) int {
l, r := 0, len(nums) - 1
for l <= r {
m := l + (r - l) / 2
if target == nums[m] {
return m
}
if target < nums[m] {
r = m - 1
} else if target > nums[m] {
l = m + 1
}
}
return l
}
```

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@ -83,3 +83,30 @@ class Solution {
}
}
```
Go Code:
```go
func searchMatrix(matrix [][]int, target int) bool {
if len(matrix) == 0 {
return false
}
row, col := len(matrix), len(matrix[0])
// 将二维数组拉平为一维
l, r := 0, row * col - 1
for l <= r {
m := l + (r - l) / 2
// 将一维的坐标转换为二维
x, y := m / col, m % col
if matrix[x][y] == target {
return true
} else if matrix[x][y] < target {
l = m + 1
} else if matrix[x][y] > target {
// 二分查找时把所有的情况都要写出来避免直接else
r = m - 1
}
}
return false
}
```

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@ -34,7 +34,7 @@ class Solution {
TreeNode cur = new TreeNode(-1);
cur = root;
Stack<TreeNode> stack = new Stack<>();
while (!stack.isEmpty() || cur != null) {
while (!stack.isEmpty() || cur != null) {
//找到当前应该遍历的那个节点
while (cur != null) {
stack.push(cur);
@ -47,7 +47,7 @@ class Solution {
cur = temp.right;
}
return arr;
}
}
}
```
@ -78,4 +78,30 @@ class Solution {
}
```
###
Go Code:
```go
func inorderTraversal(root *TreeNode) []int {
res := []int{}
if root == nil {
return res
}
stk := []*TreeNode{}
cur := root
for len(stk) != 0 || cur != nil {
// 找到当前应该遍历的那个节点并且把左子节点都入栈
for cur != nil {
stk = append(stk, cur)
cur = cur.Left
}
// 没有左子节点则开始执行出栈操作
temp := stk[len(stk) - 1]
stk = stk[: len(stk) - 1]
res = append(res, temp.Val)
cur = temp.Right
}
return res
}
```
###

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@ -426,6 +426,34 @@ class Solution {
}
```
Go Code:
```go
func levelOrder(root *TreeNode) [][]int {
res := [][]int{}
if root == nil {
return res
}
// 初始化队列时记得把root节点加进去
que := []*TreeNode{root}
for len(que) != 0 {
t := []int{}
// 这里一定要先求出来que的长度因为在迭代的过程中que的长度是变化的
l := len(que)
for i := 0; i < l; i++ {
temp := que[0]
que = que[1:]
// 子节点不为空就入队
if temp.Left != nil { que = append(que, temp.Left) }
if temp.Right != nil { que = append(que, temp.Right) }
t = append(t, temp.Val)
}
res = append(res, t)
}
return res
}
```
时间复杂度On 空间复杂度On
大家如果吃透了二叉树的层序遍历的话可以顺手把下面几道题目解决掉思路一致甚至都不用拐弯

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@ -49,10 +49,10 @@ class Solution {
public List<Integer> preorderTraversal(TreeNode root) {
List<Integer> list = new ArrayList<>();
Stack<TreeNode> stack = new Stack<>();
if (root == null) return list;
if (root == null) return list;
stack.push(root);
while (!stack.isEmpty()) {
TreeNode temp = stack.pop();
TreeNode temp = stack.pop();
if (temp.right != null) {
stack.push(temp.right);
}
@ -95,3 +95,27 @@ class Solution {
}
}
```
Go Code:
```go
func preorderTraversal(root *TreeNode) []int {
res := []int{}
if root == nil {
return res
}
stk := []*TreeNode{root}
for len(stk) != 0 {
temp := stk[len(stk) - 1]
stk = stk[: len(stk) - 1]
if temp.Right != nil {
stk = append(stk, temp.Right)
}
if temp.Left != nil {
stk = append(stk, temp.Left)
}
res = append(res, temp.Val)
}
return res
}
```

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@ -12,7 +12,7 @@
我们知道后序遍历的顺序是,` 对于树中的某节点, 先遍历该节点的左子树, 再遍历其右子树, 最后遍历该节点`
那么我们如何利用栈来解决呢
那么我们如何利用栈来解决呢
我们直接来看动画看动画之前但是我们`需要带着问题看动画`问题搞懂之后也就搞定了后序遍历
@ -104,6 +104,36 @@ class Solution {
}
```
Go Code:
```go
func postorderTraversal(root *TreeNode) []int {
res := []int{}
if root == nil {
return res
}
stk := []*TreeNode{}
cur := root
var pre *TreeNode
for len(stk) != 0 || cur != nil {
for cur != nil {
stk = append(stk, cur)
cur = cur.Left
}
// 这里符合本文最后的说法使用先获取栈顶元素但是不弹出根据栈顶元素的情况进行响应的处理
temp := stk[len(stk) - 1]
if temp.Right == nil || temp.Right == pre {
stk = stk[: len(stk) - 1]
res = append(res, temp.Val)
pre = temp
} else {
cur = temp.Right
}
}
return res
}
```
当然也可以修改下代码逻辑将 `cur = stack.pop()` 改成 `cur = stack.peek()`下面再修改一两行代码也可以实现这里这样写是方便动画模拟大家可以随意发挥
时间复杂度 On, 空间复杂度 On

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@ -100,3 +100,35 @@ public:
}
};
```
Go Code:
```go
func checkSubarraySum(nums []int, k int) bool {
m := map[int]int{}
// 由于前缀和%k可能为0所以需要给出没有元素的时候索引位置-1
m[0] = -1
sum := 0
for i, num := range nums {
sum += num
key := sum % k
/*
// 题目中告诉k >= 1
key := sum
if k != 0 {
key = sum % k
}
*/
if v, ok := m[key]; ok {
if i - v >= 2 {
return true
}
// 避免更新最小索引
continue
}
// 保存的是最小的索引
m[key] = i
}
return false
}
```

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@ -182,3 +182,24 @@ public:
}
};
```
Go Code:
```GO
func subarraySum(nums []int, k int) int {
m := map[int]int{}
// m存的是前缀和没有元素的时候和为0且有1个子数组(空数组)满足条件即m[0] = 1
m[0] = 1
sum := 0
cnt := 0
for _, num := range nums {
sum += num
if v, ok := m[sum - k]; ok {
cnt += v
}
// 更新满足前缀和的子数组数量
m[sum]++
}
return cnt
}
```

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@ -107,3 +107,23 @@ public:
}
};
```
Go Code:
```go
func pivotIndex(nums []int) int {
presum := 0
for _, num := range nums {
presum += num
}
var leftsum int
for i, num := range nums {
// 比较左半和右半是否相同
if presum - leftsum - num == leftsum {
return i
}
leftsum += num
}
return -1
}
```

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@ -129,3 +129,21 @@ public:
}
};
```
Go Code:
```go
func subarraysDivByK(nums []int, k int) int {
m := make(map[int]int)
cnt := 0
sum := 0
m[0] = 1
for _, num := range nums {
sum += num
key := (sum % k + k) % k
cnt += m[key]
m[key]++
}
return cnt
}
```

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@ -58,3 +58,25 @@ class Solution {
}
}
```
GO Code:
```go
func dailyTemperatures(temperatures []int) []int {
l := len(temperatures)
if l == 0 {
return temperatures
}
stack := []int{}
arr := make([]int, l)
for i := 0; i < l; i++ {
for len(stack) != 0 && temperatures[i] > temperatures[stack[len(stack) - 1]] {
idx := stack[len(stack) - 1]
arr[idx] = i - idx
stack = stack[: len(stack) - 1]
}
// 栈保存的是索引
stack = append(stack, i)
}
return arr
}

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@ -89,4 +89,56 @@ class MaxQueue {
}
```
GO Code:
```go
type MaxQueue struct {
que []int // 普通队列
deq []int // 双端队列
size int // que的队列长度
}
func Constructor() MaxQueue {
return MaxQueue{
que: []int{},
deq: []int{},
}
}
// Is_empty 表示队列是否为空
func (mq *MaxQueue) Is_empty() bool {
return mq.size == 0
}
// Max_value 取最大值值返回我们双端队列的对头即可因为我们双端队列是单调递减的嘛
func (mq *MaxQueue) Max_value() int {
if mq.Is_empty() { return -1 }
return mq.deq[0]
}
// Push_back 入队
func (mq *MaxQueue) Push_back(value int) {
mq.que = append(mq.que, value)
// 维护单调递减队列
for len(mq.deq) != 0 && mq.deq[len(mq.deq) - 1] < value {
mq.deq = mq.deq[:len(mq.deq) - 1]
}
mq.deq = append(mq.deq, value)
mq.size++
}
// Pop_front 弹出队列头元素并且返回其值
func (mq *MaxQueue) Pop_front() int {
if mq.Is_empty() { return -1 }
ans := mq.que[0]
mq.que = mq.que[1:]
if mq.deq[0] == ans {
mq.deq = mq.deq[1:]
}
mq.size--
return ans
}
```
###

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@ -117,4 +117,35 @@ class Solution {
}
```
GO Code:
```go
func trap(height []int) int {
stack := []int{}
water := 0
// 最左边部分不会接雨水左边持续升高时stack都会弹出所有元素
for i := 0; i< len(height); i++ {
for len(stack) != 0 && height[i] > height[stack[len(stack) - 1]] {
popnum := stack[len(stack) - 1]
// 出现相同高度的情况其实也可以不用处理如果不处理相同高度时后面的hig为0会产生很多无效的计算
for len(stack) != 0 && height[popnum] == height[stack[len(stack) - 1]] {
stack = stack[:len(stack) - 1]
}
if len(stack) == 0 { break }
le, ri := stack[len(stack) - 1], i
hig := min(height[ri], height[le]) - height[popnum]
wid := ri - le - 1
water += wid * hig
}
stack = append(stack, i)
}
return water
}
func min(a, b int) int {
if a < b { return a }
return b
}
```
###

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@ -73,4 +73,47 @@ class MinStack {
}
```
GO Code:
```go
type MinStack struct {
stack []int
minStk []int
}
/** initialize your data structure here. */
func Constructor() MinStack {
return MinStack{
stack: []int{},
minStk: []int{},
}
}
// Push 入栈如果插入值当前插入值小于栈顶元素则入栈栈顶元素保存的则为当前栈的最小元素
func (m *MinStack) Push(x int) {
m.stack = append(m.stack, x)
if len(m.minStk) == 0 || m.minStk[len(m.minStk) - 1] >= x {
m.minStk = append(m.minStk, x)
}
}
// Pop 出栈如果stack出栈等于minStk栈顶元素则说明此时栈内的最小元素改变了
func (m *MinStack) Pop() {
temp := m.stack[len(m.stack) - 1]
m.stack = m.stack[: len(m.stack) - 1]
if temp == m.minStk[len(m.minStk) - 1] {
m.minStk = m.minStk[: len(m.minStk) - 1]
}
}
// Top stack的栈顶元素
func (m *MinStack) Top() int {
return m.stack[len(m.stack) - 1]
}
// GetMin minStk的栈顶元素
func (m *MinStack) GetMin() int {
return m.minStk[len(m.minStk) - 1]
}
```
###

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@ -72,3 +72,37 @@ class Solution {
}
}
```
GO Code:
```go
func maxSlidingWindow(nums []int, k int) []int {
l := len(nums)
if l == 0 {
return nums
}
arr := []int{}
// 维护一个单调递减的双向队列
deque := []int{}
for i := 0; i < k; i++ {
for len(deque) != 0 && deque[len(deque) - 1] < nums[i] {
deque = deque[:len(deque) - 1]
}
deque = append(deque, nums[i])
}
arr = append(arr, deque[0])
for i := k; i < l; i++ {
if nums[i - k] == deque[0] {
deque = deque[1:]
}
for len(deque) != 0 && deque[len(deque) - 1] < nums[i] {
deque = deque[:len(deque) - 1]
}
deque = append(deque, nums[i])
arr = append(arr, deque[0])
}
return arr
}
```

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@ -260,3 +260,48 @@ class Solution {
}
}
```
Go Code:
```go
func longestSubarray(nums []int, limit int) int {
maxdeq := []int{} // 递减队列
mindeq := []int{} // 递增队列
length := len(nums)
left, right, maxwin := 0, 0, 0
for right < length {
for len(maxdeq) != 0 && maxdeq[len(maxdeq) - 1] < nums[right] {
maxdeq = maxdeq[: len(maxdeq) - 1]
}
maxdeq = append(maxdeq, nums[right])
for len(mindeq) != 0 && mindeq[len(mindeq) - 1] > nums[right] {
mindeq = mindeq[: len(mindeq) - 1]
}
mindeq = append(mindeq, nums[right])
for maxdeq[0] - mindeq[0] > limit {
if maxdeq[0] == nums[left] {
maxdeq = maxdeq[1:]
}
if mindeq[0] == nums[left] {
mindeq = mindeq[1:]
}
left++
}
maxwin = max(maxwin, right - left + 1)
right++
}
return maxwin
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
```

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@ -202,3 +202,20 @@ class Solution {
}
}
```
Go Code:
```go
func twoSum(nums []int, target int) []int {
m := make(map[int]int)
for i, num := range nums {
if v, ok := m[target - num]; ok {
return []int{v, i}
}
m[num] = i
}
return []int{}
}
```

View File

@ -45,7 +45,7 @@ class Solution {
if (map.containsKey(nums[i])) {
//判断是否小于K如果小于等于则直接返回
int abs = Math.abs(i - map.get(nums[i]));
if (abs <= k) return true;//小于等于则返回
if (abs <= k) return true;//小于等于则返回
}
//更新索引此时有两种情况不存在或者存在时将后出现的索引保存
map.put(nums[i],i);
@ -72,7 +72,7 @@ class Solution:
# 判断是否小于K如果小于等于则直接返回
a = abs(i - m[nums[i]])
if a <= k:
return True# 小于等于则返回
return True# 小于等于则返回
# 更新索引此时有两种情况不存在或者存在时将后出现的索引保存
m[nums[i]] = i
return False
@ -222,3 +222,25 @@ class Solution {
}
}
```
Go Code:
```go
func containsNearbyDuplicate(nums []int, k int) bool {
length := len(nums)
if length == 0 {
return false
}
m := map[int]int{}
for i := 0; i < length; i++ {
if v, ok := m[nums[i]]; ok {
if i - v <= k {
return true
}
}
m[nums[i]] = i
}
return false
}
```

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@ -182,3 +182,25 @@ class Solution {
}
}
```
Go Code:
```go
func removeElement(nums []int, val int) int {
length := len(nums)
if length == 0 {
return 0
}
i := 0
for j := 0; j < length; j++ {
if nums[j] == val {
continue
}
nums[i] = nums[j]
i++
}
return i
}
```

View File

@ -273,3 +273,28 @@ public:
}
};
```
Go Code:
```go
func firstMissingPositive(nums []int) int {
length := len(nums)
if length == 0 { return 1 }
for i := 0; i < length; i++ {
// 将不在正确位置的元素放在正确的位置上
for nums[i] > 0 && nums[i] < length + 1 && nums[i] != i + 1 && nums[i] != nums[nums[i] - 1] {
j := nums[i] - 1
nums[i], nums[j] = nums[j], nums[i]
}
}
// 第一个不在正确位置上的元素就是结果
for i := 0; i < length; i++ {
if nums[i] != i + 1 {
return i + 1
}
}
return length + 1
}
```

View File

@ -22,7 +22,7 @@
下面我们通过一个视频模拟代码执行步骤大家一下就能搞懂了
![leetcode485最长连续1的个数](https://cdn.jsdelivr.net/gh/tan45du/test1@master/20210122/leetcode485最长连续1的个数.7avzcthkit80.gif)
![leetcode485最长连续1的个数](https://cdn.jsdelivr.net/gh/tan45du/test1@master/20210122/leetcode485最长连续1的个数.7avzcthkit80.gif)
下面我们直接看代码吧
@ -207,3 +207,28 @@ public:
}
};
```
Go Code:
```go
func findMaxConsecutiveOnes(nums []int) int {
cnt, maxCnt := 0, 0
for i := 0; i < len(nums); i++ {
if nums[i] == 1 {
cnt++
} else {
maxCnt = max(maxCnt, cnt)
cnt = 0
}
}
return max(maxCnt, cnt)
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
```

View File

@ -180,3 +180,42 @@ class Solution {
}
}
```
Go Code:
```go
func spiralOrder(matrix [][]int) []int {
res := []int{}
left, right := 0, len(matrix[0]) - 1
top, down := 0, len(matrix) - 1
for {
for i := left; i <= right; i++ {
res = append(res, matrix[top][i])
}
top++
if top > down { break }
for i := top; i <= down; i++ {
res = append(res, matrix[i][right])
}
right--
if left > right { break }
for i := right; i >= left; i-- {
res = append(res, matrix[down][i])
}
down--
if top > down { break }
for i := down; i >= top; i-- {
res = append(res, matrix[i][left])
}
left++
if left > right { break }
}
return res
}
```

View File

@ -217,3 +217,23 @@ public:
}
};
```
Go Code:
```go
func subarraySum(nums []int, k int) int {
m := map[int]int{}
m[0] = 1
sum := 0
cnt := 0
for _, num := range nums {
sum += num
if v, ok := m[sum - k]; ok {
cnt += v
}
m[sum]++
}
return cnt
}
```

View File

@ -360,3 +360,49 @@ class Solution {
}
}
```
Go Code:
```go
func generateMatrix(n int) [][]int {
res := make([][]int, n)
for i := 0; i < n; i++ {
res[i] = make([]int, n)
}
left, right := 0, n - 1
top, buttom := 0, n - 1
size, num := n * n, 1
for {
for i := left; i <= right; i++ {
res[top][i] = num
num++
}
top++
if num > size { break }
for i := top; i <= buttom; i++ {
res[i][right] = num
num++
}
right--
if num > size { break }
for i := right; i >= left; i-- {
res[buttom][i] = num
num++
}
buttom--
if num > size { break }
for i := buttom; i >= top; i-- {
res[i][left] = num
num++
}
left++
if num > size { break }
}
return res
}
```

View File

@ -2,7 +2,7 @@
>
> 感谢支持该仓库会一直维护希望对各位有一丢丢帮助
>
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
#### [66. 加一](https://leetcode-cn.com/problems/plus-one/)
@ -56,10 +56,10 @@ class Solution {
if (digits[i] != 0) {
return digits;
}
}
//第三种情况因为数组初始化每一位都为0我们只需将首位设为1即可
int[] arr = new int[len+1];
int[] arr = new int[len+1];
arr[0] = 1;
return arr;
}
@ -122,3 +122,20 @@ class Solution {
}
}
```
Go Code:
```go
func plusOne(digits []int) []int {
l := len(digits)
for i := l - 1; i >= 0; i-- {
digits[i] = (digits[i] + 1) % 10
if digits[i] != 0 {
return digits
}
}
digits = append([]int{1}, digits...)
return digits
}
```

View File

@ -48,7 +48,7 @@ class Solution {
//这里和三向切分不完全一致
int i = left;
int right = len-1;
while (i <= right) {
if (nums[i] == 2) {
swap(nums,i,right--);
@ -57,7 +57,7 @@ class Solution {
} else {
i++;
}
}
}
}
public void swap (int[] nums, int i, int j) {
int temp = nums[i];
@ -72,7 +72,7 @@ Python3 Code:
```python
from typing import List
class Solution:
def sortColors(self, nums: List[int]):
def sortColors(self, nums: List[int]):
leng = len(nums)
left = 0
# 这里和三向切分不完全一致
@ -89,7 +89,7 @@ class Solution:
else:
i += 1
return nums
def swap(self, nums: List[int], i: int, j: int):
temp = nums[i]
nums[i] = nums[j]
@ -112,7 +112,7 @@ public:
} else {
i++;
}
}
}
}
};
```
@ -149,6 +149,32 @@ class Solution {
}
```
Go Code:
```go
func sortColors(nums []int) {
length := len(nums)
left, right := 0, length - 1
i := left
for i <= right {
if nums[i] == 2 {
// 把2换到最后
nums[i], nums[right] = nums[right], nums[i]
right--
} else if nums[i] == 0 {
// 把0换到最前面
nums[i], nums[left] = nums[left], nums[i]
i++
left++
} else {
i++
}
}
}
```
另外我们看这段代码有什么问题呢那就是我们即使完全符合时仍会交换元素这样会大大降低我们的效率
例如[0,0,0,1,1,1,2,2,2]
@ -177,7 +203,7 @@ class Solution {
int len = nums.length;
int right = len - 1;
for (int i = 0; i <= right; ++i) {
if (nums[i] == 0) {
if (nums[i] == 0) {
swap(nums,i,left);
left++;
}
@ -190,7 +216,7 @@ class Solution {
}
}
}
}
public void swap (int[] nums,int i, int j) {
int temp = nums[i];
@ -220,7 +246,7 @@ class Solution:
# 如果不等于 1 则需要继续判断所以不移动 i 指针i--
if nums[i] != 1:
i -= 1
i += 1
i += 1
return nums
def swap(self, nums: List[int], i: int, j: int):
@ -238,7 +264,7 @@ public:
int left = 0, len = nums.size();
int right = len - 1;
for (int i = 0; i <= right; ++i) {
if (nums[i] == 0) {
if (nums[i] == 0) {
swap(nums[i],nums[left++]);
}
if (nums[i] == 2) {
@ -265,7 +291,7 @@ class Solution {
//nums.swapAt(i, left) 直接调用系统方法
self.swap(&nums, i, left) // 保持风格统一走自定义交换
left += 1
}
}
if nums[i] == 2 {
//nums.swapAt(i, right) 直接调用系统方法
self.swap(&nums, i, right) // 保持风格统一走自定义交换
@ -286,3 +312,28 @@ class Solution {
}
}
```
Go Code:
```go
func sortColors(nums []int) {
length := len(nums)
left, right := 0, length - 1
for i := 0; i <= right; i++ {
if nums[i] == 0 {
// 为0时和头交换
nums[i], nums[left] = nums[left], nums[i]
left++
} else if nums[i] == 2 {
// 为2时和尾交换
nums[i], nums[right] = nums[right], nums[i]
right--
// 不为1时需要把i减回去
if nums[i] != 1 {
i--
}
}
}
}
```

View File

@ -2,7 +2,7 @@
>
> 感谢支持该仓库会一直维护希望对各位有一丢丢帮助
>
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
#### [剑指 Offer 03. 数组中重复的数字](https://leetcode-cn.com/problems/shu-zu-zhong-zhong-fu-de-shu-zi-lcof/)
@ -16,7 +16,7 @@
输入
[2, 3, 1, 0, 2, 5, 3]
输出2 3
输出2 3
#### **HashSet**
@ -174,3 +174,24 @@ class Solution {
}
}
```
Go Code:
```go
func findRepeatNumber(nums []int) int {
l := len(nums)
if l == 0 {
return -1
}
for i := 0; i < l; i++ {
// 将nums[i]换到i的位置
for nums[i] != i {
if nums[i] == nums[nums[i]] {
return nums[i]
}
nums[i], nums[nums[i]] = nums[nums[i]], nums[i]
}
}
return -1
}
```

View File

@ -119,3 +119,35 @@ class Solution {
}
}
```
Go Code:
```go
func minSubArrayLen(target int, nums []int) int {
length := len(nums)
winLen := length + 1
i := 0
sum := 0
for j := 0; j < length; j++ {
sum += nums[j]
for sum >= target {
winLen = min(winLen, j - i + 1)
sum -= nums[i]
i++
}
}
if winLen == length + 1 {
return 0
}
return winLen
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
```

View File

@ -162,3 +162,52 @@ class Solution {
}
}
```
Go Code:
```go
func threeSum(nums []int) [][]int {
res := [][]int{}
length := len(nums)
if length < 3 {
return res
}
sort.Ints(nums)
for i := 0; i < length - 2; i++ {
// 去重
if i != 0 && nums[i] == nums[i - 1] {
continue
}
l, r := i + 1, length - 1
for l < r {
/*
// 下面两个for循环的去重也可以用下面的代码替换
if l != i + 1 && nums[l] == nums[l - 1] {
l++
continue
}
*/
if nums[i] + nums[l] + nums[r] == 0 {
res = append(res, []int{nums[i], nums[l], nums[r]})
for l < r && nums[l] == nums[l + 1] {
l++
}
for l < r && nums[r] == nums[r - 1] {
r--
}
l++
r--
} else if nums[i] + nums[l] + nums[r] < 0 {
l++
} else {
r--
}
}
}
return res
}
```

View File

@ -54,6 +54,21 @@ class Solution {
}
```
Go Code:
```go
func twoSum(nums []int, target int) []int {
m := make(map[int]int)
for i, num := range nums {
if v, ok := m[target - num]; ok {
return []int{v, i}
}
m[num] = i
}
return []int{}
}
```
### 双指针暴力
#### 解析

View File

@ -95,3 +95,61 @@ class Solution {
}
}
```
Go Code:
```go
func fourSum(nums []int, target int) [][]int {
res := [][]int{}
length := len(nums)
if length < 4 {
return res
}
sort.Ints(nums)
for i := 0; i < length - 3; i++ {
// 去重
if i != 0 && nums[i] == nums[i - 1] {
continue
}
for j := i + 1; j < length - 2; j++ {
// 去重
if j != i + 1 && nums[j] == nums[j - 1] {
continue
}
l, r := j + 1, length - 1
for l < r {
/*
// 下面两个for循环的去重也可以用下面的代码替换
if l != i + 1 && nums[l] == nums[l - 1] {
l++
continue
}
*/
sum := nums[i] + nums[j] + nums[l] + nums[r]
if sum == target {
res = append(res, []int{nums[i], nums[j], nums[l], nums[r]})
for l < r && nums[l] == nums[l + 1] {
l++
}
for l < r && nums[r] == nums[r - 1] {
r--
}
l++
r--
} else if sum < target {
l++
} else {
r--
}
}
}
}
return res
}
```

View File

@ -131,6 +131,26 @@ class Solution:
return y
```
Go Code:
```go
func singleNumber(nums []int) int {
if len(nums) == 1 {
return nums[0]
}
m := map[int]int{}
for _, x := range nums {
m[x]++
}
for k, v := range m {
if v == 1 {
return k
}
}
return 0
}
```
### 排序搜索法
#### 解析
@ -208,6 +228,28 @@ class Solution:
return nums[len(nums) - 1]
```
Go Code:
```go
func singleNumber(nums []int) int {
if len(nums) == 1 {
return nums[0]
}
sort.Ints(nums)
for i := 1; i < len(nums) - 1; i+=2 {
if nums[i] == nums[i - 1] {
continue
} else {
return nums[i - 1]
}
}
return nums[len(nums) - 1]
}
```
### HashSet
#### 解析
@ -565,4 +607,17 @@ class Solution:
return reduce(lambda num, x: num ^ x, nums, 0)
```
Go Code:
```go
func singleNumber(nums []int) int {
res := 0
for _, x := range nums {
res ^= x
}
return res
}
```
本题一共介绍了 6 种解题方法肯定还有别的方法欢迎大家讨论大家可以在做题的时候一题多解这样能大大提高自己解题能力下面我们来看一下这些方法如何应用到其他题目上

View File

@ -2,7 +2,7 @@
>
> 感谢支持该仓库会一直维护希望对各位有一丢丢帮助
>
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
#### [137. 只出现一次的数字 II](https://leetcode-cn.com/problems/single-number-ii/)
@ -216,6 +216,27 @@ class Solution:
return res
```
Go Code:
```go
func singleNumber(nums []int) int {
res := 0
// Go语言中int占32位以上
for i := 0; i < 64; i++ {
cnt := 0
for j := 0; j < len(nums); j++ {
if (nums[j] >> i & 1) == 1 {
cnt++
}
}
if cnt % 3 != 0{
res = res | 1 << i
}
}
return res
}
```
我们来解析一下我们的代码
> **<<** 左移运算符运算数的各二进位全部左移若干位 **<<** 右边的数字指定了移动的位数高位丢弃低位补 0

View File

@ -263,3 +263,26 @@ class Solution:
arr[1] ^= y
return arr
```
Go Code:
```go
func singleNumber(nums []int) []int {
temp := 0
for _, x := range nums {
temp ^= x
}
// 保留最后那个1为了区分两个数
group := temp & (^temp + 1)
res := make([]int, 2)
for _, x := range nums {
if group & x == 0{
res[0] ^= x
} else {
res[1] ^= x
}
}
return res
}
```

View File

@ -173,6 +173,30 @@ class Solution {
}
```
Go Code:
```go
func isPalindrome(head *ListNode) bool {
// 将节点中的值按顺序放在arr中
arr := []int{}
node := head
for node != nil {
arr = append(arr, node.Val)
node = node.Next
}
// 双指针判断是否为回文
l, r := 0, len(arr) - 1
for l < r {
if arr[l] != arr[r] {
return false
}
l++
r--
}
return true
}
```
这个方法可以直接通过但是这个方法需要辅助数组那我们还有其他更好的方法吗
**双指针翻转链表法**
@ -201,7 +225,7 @@ class Solution {
ListNode backhalf = reverse(midnode.next);
//遍历两部分链表判断值是否相等
ListNode p1 = head;
ListNode p2 = backhalf;
ListNode p2 = backhalf;
while (p2 != null) {
if (p1.val != p2.val) {
//若要还原记得这里也要reverse
@ -210,11 +234,11 @@ class Solution {
}
p1 = p1.next;
p2 = p2.next;
}
}
//还原链表并返回结果这一步是需要注意的我们不可以破坏初始结构我们只是判断是否为回文
//当然如果没有这一步也是可以AC但是面试的时候题目要求可能会有这一条
midnode.next = reverse(backhalf);
return true;
return true;
}
//找到中点
public ListNode searchmidnode (ListNode head) {
@ -223,7 +247,7 @@ class Solution {
while (fast.next != null && fast.next.next != null) {
fast = fast.next.next;
slow = slow.next;
}
}
return slow;
}
//翻转链表
@ -258,7 +282,7 @@ public:
ListNode * backhalf = reverse(midnode->next);
//遍历两部分链表判断值是否相等
ListNode * p1 = head;
ListNode * p2 = backhalf;
ListNode * p2 = backhalf;
while (p2 != nullptr) {
if (p1->val != p2->val) {
//若要还原记得这里也要reverse
@ -267,11 +291,11 @@ public:
}
p1 = p1->next;
p2 = p2->next;
}
}
//还原链表并返回结果这一步是需要注意的我们不可以破坏初始结构我们只是判断是否为回文
//当然如果没有这一步也是可以AC但是面试的时候题目要求可能会有这一条
midnode->next = reverse(backhalf);
return true;
return true;
}
//找到中间的部分
ListNode * searchmidnode (ListNode * head) {
@ -280,7 +304,7 @@ public:
while (fast->next != nullptr && fast->next->next != nullptr) {
fast = fast->next->next;
slow = slow->next;
}
}
return slow;
}
//翻转链表
@ -302,55 +326,55 @@ JS Code:
```javascript
var isPalindrome = function (head) {
if (head === null || head.next === null) {
return true;
}
//找到中间节点也就是翻转的头节点这个在昨天的题目中讲到
//但是今天和昨天有一些不一样的地方就是如果有两个中间节点返回第一个昨天的题目是第二个
let midnode = searchmidnode(head);
//原地翻转链表需要两个辅助指针这个也是面试题目大家可以做一下
//这里我们用的是midnode.next需要注意因为我们找到的是中点但是我们翻转的是后半部分
let backhalf = reverse(midnode.next);
//遍历两部分链表判断值是否相等
let p1 = head;
let p2 = backhalf;
while (p2 != null) {
if (p1.val != p2.val) {
//若要还原记得这里也要reverse
midnode.next = reverse(backhalf);
return false;
if (head === null || head.next === null) {
return true;
}
p1 = p1.next;
p2 = p2.next;
}
//还原链表并返回结果这一步是需要注意的我们不可以破坏初始结构我们只是判断是否为回文
//当然如果没有这一步也是可以AC但是面试的时候题目要求可能会有这一条
midnode.next = reverse(backhalf);
return true;
//找到中间节点也就是翻转的头节点这个在昨天的题目中讲到
//但是今天和昨天有一些不一样的地方就是如果有两个中间节点返回第一个昨天的题目是第二个
let midnode = searchmidnode(head);
//原地翻转链表需要两个辅助指针这个也是面试题目大家可以做一下
//这里我们用的是midnode.next需要注意因为我们找到的是中点但是我们翻转的是后半部分
let backhalf = reverse(midnode.next);
//遍历两部分链表判断值是否相等
let p1 = head;
let p2 = backhalf;
while (p2 != null) {
if (p1.val != p2.val) {
//若要还原记得这里也要reverse
midnode.next = reverse(backhalf);
return false;
}
p1 = p1.next;
p2 = p2.next;
}
//还原链表并返回结果这一步是需要注意的我们不可以破坏初始结构我们只是判断是否为回文
//当然如果没有这一步也是可以AC但是面试的时候题目要求可能会有这一条
midnode.next = reverse(backhalf);
return true;
};
//找到中点
var searchmidnode = function (head) {
let fast = head;
let slow = head;
while (fast.next != null && fast.next.next != null) {
fast = fast.next.next;
slow = slow.next;
}
return slow;
let fast = head;
let slow = head;
while (fast.next != null && fast.next.next != null) {
fast = fast.next.next;
slow = slow.next;
}
return slow;
};
//翻转链表
var reverse = function (slow) {
let low = null;
let temp = null;
while (slow != null) {
temp = slow.next;
slow.next = low;
low = slow;
slow = temp;
}
return low;
let temp = null;
while (slow != null) {
temp = slow.next;
slow.next = low;
low = slow;
slow = temp;
}
return low;
};
```
@ -457,3 +481,53 @@ class Solution {
}
}
```
Go Code:
```go
func isPalindrome(head *ListNode) bool {
if head == nil || head.Next == nil {
return true
}
midNode := searchMidNode(head)
backHalf := reverse(midNode.Next)
// 判断左右两边是否一样回文
p1, p2 := head, backHalf
for p2 != nil {
if p1.Val != p2.Val {
midNode.Next = reverse(backHalf)
return false
}
p1 = p1.Next
p2 = p2.Next
}
// 不破坏原来的数据
midNode.Next = reverse(backHalf)
return true
}
// searchMidNode 求中间的节点
func searchMidNode(head *ListNode) *ListNode {
fast, slow := head, head
for fast.Next != nil && fast.Next.Next != nil {
fast = fast.Next.Next
slow = slow.Next
}
return slow
}
// reverse 反转链表
func reverse(node *ListNode) *ListNode {
var pre *ListNode
for node != nil {
nxt := node.Next
node.Next = pre
pre = node
node = nxt
}
return pre
}
```

View File

@ -124,3 +124,22 @@ class Solution {
}
}
```
Go Code:
```go
func hasCycle(head *ListNode) bool {
if head == nil { return false }
s, f := head, head
for f != nil && f.Next != nil {
s = s.Next
f = f.Next.Next
if s == f {
return true
}
}
return false
}
```

View File

@ -297,3 +297,29 @@ class Solution {
}
}
```
Go Code:
```go
func detectCycle(head *ListNode) *ListNode {
if head == nil { return nil }
s, f := head, head
for f != nil && f.Next != nil {
s = s.Next
f = f.Next.Next
// 快慢指针相遇
if f == s {
// 快指针从头开始一步一步走也可以用一个新的指针
f = head
for f != s {
f = f.Next
s = s.Next
}
return f
}
}
return nil
}
```

View File

@ -257,3 +257,36 @@ class Solution {
}
}
```
Go Code:
```go
func insertionSortList(head *ListNode) *ListNode {
if head == nil || head.Next == nil { return head }
root := &ListNode{
Next: head,
}
cur, nxt := head, head.Next
for nxt != nil {
// 有序的不需要换位置
if cur.Val <= nxt.Val {
cur = cur.Next
nxt = nxt.Next
continue
}
temp := root
for temp.Next.Val <= nxt.Val {
temp = temp.Next
}
// 此时找到合适的位置
cur.Next = nxt.Next
nxt.Next = temp.Next
temp.Next = nxt
// 继续向下
nxt = cur.Next
}
return root.Next
}
```

View File

@ -164,6 +164,27 @@ class Solution {
}
```
Go Code:
```go
func reverseList(head *ListNode) *ListNode {
if head == nil || head.Next == nil { return head }
cur := head
var pre *ListNode
for cur != nil {
nxt := cur.Next
cur.Next = pre
pre = cur
cur = nxt
if nxt == nil {
return pre
}
nxt = nxt.Next
}
return pre
}
```
上面的迭代写法是不是搞懂啦现在还有一种递归写法不是特别容易理解刚开始刷题的同学可以只看迭代解法
**题目代码**
@ -217,19 +238,19 @@ JS Code:
```javascript
var reverseList = function (head) {
//结束条件
if (!head || !head.next) {
return head;
}
//保存最后一个节点
let pro = reverseList(head.next);
//将节点进行反转我们可以这样理解 4.next.next = 4
//4.next = 5
// 5.next = 4 则实现了反转
head.next.next = head;
//防止循环
head.next = null;
return pro;
//结束条件
if (!head || !head.next) {
return head;
}
//保存最后一个节点
let pro = reverseList(head.next);
//将节点进行反转我们可以这样理解 4.next.next = 4
//4.next = 5
// 5.next = 4 则实现了反转
head.next.next = head;
//防止循环
head.next = null;
return pro;
};
```

View File

@ -2,7 +2,7 @@
>
> 感谢支持该仓库会一直维护希望对各位有一丢丢帮助
>
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
> 另外希望手机阅读的同学可以来我的 <u>[**公众号袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步想要和题友一起刷题互相监督的同学可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入
### [328. 奇偶链表](https://leetcode-cn.com/problems/odd-even-linked-list/)
@ -21,7 +21,7 @@
示例 2:
> 输入: 2->1->3->5->6->4->7->NULL
> 输入: 2->1->3->5->6->4->7->NULL
> 输出: 2->3->6->7->1->5->4->NULL
#### 题目解析
@ -54,7 +54,7 @@ class Solution {
odd = odd.next;
even.next = odd.next;
even = even.next;
}
}
//链接
odd.next = evenHead;
return head;
@ -81,7 +81,7 @@ public:
odd = odd->next;
even->next = odd->next;
even = even->next;
}
}
//链接
odd->next = evenHead;
return head;
@ -98,15 +98,15 @@ var oddEvenList = function (head) {
even = head.next,
evenHead = even;
while (odd.next && even.next) {
//将偶数位合在一起奇数位合在一起
odd.next = even.next;
odd = odd.next;
even.next = odd.next;
even = even.next;
}
//链接
odd.next = evenHead;
return head;
//将偶数位合在一起奇数位合在一起
odd.next = even.next;
odd = odd.next;
even.next = odd.next;
even = even.next;
}
//链接
odd.next = evenHead;
return head;
};
```
@ -155,3 +155,23 @@ class Solution {
}
}
```
Go Code:
```go
func oddEvenList(head *ListNode) *ListNode {
if head == nil || head.Next == nil {
return head
}
odd, even := head, head.Next
evenHead := even
for odd.Next != nil && even.Next != nil {
odd.Next = even.Next
odd = odd.Next
even.Next = odd.Next
even = even.Next
}
odd.Next = evenHead
return head
}
```

View File

@ -194,3 +194,32 @@ class Solution {
}
}
```
Go Code:
```go
func deleteDuplicates(head *ListNode) *ListNode {
// 新建一个头结点他的下一个节点才是开始
root := &ListNode{
Next: head,
}
pre, cur := root, head
for cur != nil && cur.Next != nil {
if cur.Val == cur.Next.Val {
// 相等的话cur就一直向后移动
for cur != nil && cur.Next != nil && cur.Val == cur.Next.Val {
cur = cur.Next
}
// 循环后移动到了最后一个相同的节点
cur = cur.Next
pre.Next = cur
} else {
cur = cur.Next
pre = pre.Next
}
}
return root.Next
}
```

View File

@ -187,3 +187,31 @@ class Solution {
}
}
```
Go Code:
```go
func partition(head *ListNode, x int) *ListNode {
big, small := &ListNode{}, &ListNode{}
headBig, headSmall := big, small
temp := head
for temp != nil {
// 分开存
if temp.Val < x {
small.Next = temp
small = small.Next
} else {
big.Next = temp
big = big.Next
}
temp = temp.Next
}
// 最后一个节点指向nil
big.Next = nil
// 存小数的链表和存大数的连起来
small.Next = headBig.Next
return headSmall.Next
}
```

View File

@ -263,3 +263,48 @@ class Solution {
}
}
```
GoCode:
```go
func reverseBetween(head *ListNode, left int, right int) *ListNode {
root := &ListNode{
Next: head,
}
temp := root
i := 0
// left的前一个节点
for ; i < left - 1; i++ {
temp = temp.Next
}
leftNode := temp
// right的后一个节点
for ; i < right; i++ {
temp = temp.Next
}
rightNode := temp.Next
// 切断链表
temp.Next = nil
newhead := leftNode.Next
leftNode.Next = nil
// 反转后将3段链表接上
leftNode.Next = reverse(newhead)
newhead.Next = rightNode
return root.Next
}
func reverse(head *ListNode) *ListNode {
var pre *ListNode
cur := head
for cur != nil {
temp := cur
cur = cur.Next
temp.Next = pre
pre = temp
}
return pre
}
```

View File

@ -146,3 +146,31 @@ class Solution {
}
}
```
Go Code:
```go
func mergeTwoLists(l1 *ListNode, l2 *ListNode) *ListNode {
root := &ListNode{}
node := root
for l1 != nil && l2 != nil {
if l1.Val < l2.Val {
node.Next = l1
l1 = l1.Next
} else {
node.Next = l2
l2 = l2.Next
}
node = node.Next
}
// node接上l1或l2剩下的节点
if l1 != nil {
node.Next = l1
} else {
node.Next = l2
}
return root.Next
}
```

View File

@ -265,6 +265,28 @@ class Solution {
}
```
Go Code:
```go
func getIntersectionNode(headA, headB *ListNode) *ListNode {
tempA, tempB := headA, headB
for tempA != tempB {
// 如果不为空就指针下移为空就跳到另一链表的头部
if tempA == nil {
tempA = headB
} else {
tempA = tempA.Next
}
if tempB == nil {
tempB = headA
} else {
tempB = tempB.Next
}
}
return tempA
}
```
好啦链表的题目就结束啦希望大家能有所收获下周就要更新新的题型啦继续坚持肯定会有收获的
<br/>

View File

@ -163,3 +163,23 @@ class Solution {
}
}
```
Go Code:
```go
func getKthFromEnd(head *ListNode, k int) *ListNode {
if head == nil { return head }
pro, after := head, head
//先移动绿指针到指定位置
for i := 0; i < k - 1; i++ {
pro = pro.Next
}
for pro.Next != nil {
pro = pro.Next
after = after.Next
}
return after
}
```

View File

@ -135,3 +135,19 @@ class Solution {
}
}
```
Go Code:
```go
func middleNode(head *ListNode) *ListNode {
// 快慢指针
fast, slow := head, head
for fast != nil && fast.Next != nil {
fast = fast.Next.Next
slow = slow.Next
}
return slow
}
```

View File

@ -267,3 +267,42 @@ class Solution {
}
}
```
Go Code:
```go
func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode {
root := &ListNode{}
temp := root
// 用来保存进位值初始化为0
mod := 0
for (l1 != nil || l2 != nil) {
l1num := 0
if l1 != nil { l1num = l1.Val }
l2num := 0
if l2 != nil { l2num = l2.Val }
// 将链表的值和进位值相加得到为返回链表的值
sum := l1num + l2num + mod
// 更新进位值例18/10=19/10=0
mod = sum / 10
// 新节点保存的值18%8=2则添加2
sum = sum % 10
newNode := &ListNode{
Val: sum,
}
temp.Next = newNode
temp = temp.Next
if l1 != nil { l1 = l1.Next }
if l2 != nil { l2 = l2.Next }
}
if mod != 0 {
newNode := &ListNode{
Val: mod,
}
temp.Next = newNode
}
return root.Next
}
```