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数组篇增加部分C++代码

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This commit is contained in:
Morisummer 2021-07-15 23:14:17 +08:00
parent 2c4afffbd3
commit 2d926ff3cb
5 changed files with 208 additions and 3 deletions
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36
animation-simulation/数组篇/leetcode219数组中重复元素2.md
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@ -78,6 +78,22 @@ class Solution:
return False
```
C++ Code:
```cpp
class Solution {
public:
bool containsNearbyDuplicate(vector<int>& nums, int k) {
unordered_map <int, int> m;
for(int i = 0; i < nums.size(); ++i){
if(m.count(nums[i]) && i - m[nums[i]] <= k) return true;
m[nums[i]] = i;
}
return false;
}
};
```
**HashSet**
**解析**
@ -139,4 +155,22 @@ class Solution:
if len(s) > k:
s.remove(nums[i - k])
return False
```
```
C++ Code:
```cpp
class Solution {
public:
bool containsNearbyDuplicate(vector<int>& nums, int k) {
multiset <int> S;
for(int i = 0; i < nums.size(); ++i){
if(S.count(nums[i])) return true;
S.insert(nums[i]);
if(S.size() > k) S.erase(nums[i - k]);
}
return false;
}
};
```

36
animation-simulation/数组篇/leetcode54螺旋矩阵.md
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@ -85,6 +85,42 @@ class Solution {
```
C++ Code:
```cpp
class Solution {
public:
vector<int> spiralOrder(vector<vector<int>>& matrix) {
vector <int> arr;
int left = 0, right = matrix[0].size()-1;
int top = 0, down = matrix.size()-1;
while (true) {
for (int i = left; i <= right; ++i) {
arr.emplace_back(matrix[top][i]);
}
top++;
if (top > down) break;
for (int i = top; i <= down; ++i) {
arr.emplace_back(matrix[i][right]);
}
right--;
if (left > right) break;
for (int i = right; i >= left; --i) {
arr.emplace_back(matrix[down][i]);
}
down--;
if (top > down) break;
for (int i = down; i >= top; --i) {
arr.emplace_back(matrix[i][left]);
}
left++;
if (left > right) break;
}
return arr;
}
};
```
Python3 Code:
```python

72
animation-simulation/数组篇/leetcode59螺旋矩阵2.md
View File

@ -140,6 +140,42 @@ class Solution:
return arr
```
C++ Code:
```cpp
class Solution {
public:
vector<int> spiralOrder(vector<vector<int>>& matrix) {
vector <int> arr;
int left = 0, right = matrix[0].size()-1;
int top = 0, down = matrix.size()-1;
while (true) {
for (int i = left; i <= right; ++i) {
arr.emplace_back(matrix[top][i]);
}
top++;
if (top > down) break;
for (int i = top; i <= down; ++i) {
arr.emplace_back(matrix[i][right]);
}
right--;
if (left > right) break;
for (int i = right; i >= left; --i) {
arr.emplace_back(matrix[down][i]);
}
down--;
if (top > down) break;
for (int i = down; i >= top; --i) {
arr.emplace_back(matrix[i][left]);
}
left++;
if (left > right) break;
}
return arr;
}
};
```
我们仅仅是将 54 反过来了，往螺旋矩阵里面插值，下面我们直接看代码吧,大家可以也可以对其改进，大家可以思考一下，如果修改能够让代码更简洁！
Java Code:
@ -226,3 +262,39 @@ class Solution:
return arr.tolist()
```
C++ Code:
```cpp
class Solution {
public:
vector<vector<int>> generateMatrix(int n) {
vector <vector <int>> arr(n, vector <int>(n));
int left = 0, right = n-1, top = 0, buttom = n - 1, num = 1, numsize = n * n;
while (true) {
for (int i = left; i <= right; ++i) {
arr[top][i] = num++;
}
top++;
if (num > numsize) break;
for (int i = top; i <= buttom; ++i) {
arr[i][right] = num++;
}
right--;
if (num > numsize) break;
for (int i = right; i >= left; --i) {
arr[buttom][i] = num++;
}
buttom--;
if (num > numsize) break;
for (int i = buttom; i >= top; --i) {
arr[i][left] = num++;
}
left++;
if (num > numsize) break;
}
return arr;
}
};
```

20
animation-simulation/数组篇/leetcode66加一.md
View File

@ -3,7 +3,6 @@
> 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。
>
#### [66. 加一](https://leetcode-cn.com/problems/plus-one/)
@ -85,3 +84,22 @@ class Solution:
arr[0] = 1
return arr
```
C++ Code:
```cpp
class Solution {
public:
vector<int> plusOne(vector<int>& digits) {
for(int i = digits.size() - 1; i >= 0; --i){
digits[i] = (digits[i] + 1)%10;
if(digits[i]) return digits;
}
for(int & x: digits) x = 0;
digits.emplace_back(1);
reverse(digits.begin(), digits.end());
return digits;
}
};
```

47
animation-simulation/数组篇/leetcode75颜色分类.md
View File

@ -96,6 +96,27 @@ class Solution:
nums[j] = temp
```
C++ Code:
```cpp
class Solution {
public:
void sortColors(vector<int>& nums) {
int len = nums.size(), left = 0;
int i = left, right = len-1;
while (i <= right) {
if (nums[i] == 2) {
swap(nums[i],nums[right--]);
} else if (nums[i] == 0) {
swap(nums[i++],nums[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]
@ -174,4 +195,28 @@ class Solution:
temp = nums[i]
nums[i] = nums[j]
nums[j] = temp
```
```
C++ Code:
```cpp
class Solution {
public:
void sortColors(vector<int>& nums) {
int left = 0, len = nums.size();
int right = len - 1;
for (int i = 0; i <= right; ++i) {
if (nums[i] == 0) {
swap(nums[i],nums[left++]);
}
if (nums[i] == 2) {
swap(nums[i],nums[right--]);
if (nums[i] != 1) {
i--;
}
}
}
}
};
```