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Update 堆排序.md

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去掉堆排序多申请的数组
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xiaox0321 2022-02-18 19:05:04 +08:00 committed by GitHub
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animation-simulation/数据结构和算法/堆排序.md
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@ -219,40 +219,39 @@ def sink(nums: list, index: int, len: int):
Java Code:
```java
class Solution {
public class Solution {
int rollBack(int i) {
return i - 1;
}
public int[] sortArray(int[] nums) {
int len = nums.length;
int[] a = new int[len + 1];
for (int i = 0; i < nums.length; ++i) {
a[i+1] = nums[i];
}
//下沉建堆
for (int i = len/2; i >= 1; --i) {
sink(a,i,len);
for (int i = len / 2; i >= 1; --i) {
sink(nums, i, len);
}
int k = len;
//排序
while (k > 1) {
swap(a,1,k--);
sink(a,1,k);
}
for (int i = 1; i < len+1; ++i) {
nums[i-1] = a[i];
swap(nums, 1, k--);
sink(nums, 1, k);
}
return nums;
}
public void sink (int[] nums, int k,int end) {
public void sink(int[] nums, int k, int end) {
//下沉
while (2 * k <= end) {
int j = 2 * k;
//找出子节点中最大或最小的那个
if (j + 1 <= end && nums[j + 1] > nums[j]) {
if (j + 1 <= end && nums[rollBack(j + 1)] > nums[rollBack(j)]) {
j++;
}
if (nums[j] > nums[k]) {
if (nums[rollBack(j)] > nums[rollBack(k)]) {
swap(nums, j, k);
} else {
break;
@ -260,10 +259,11 @@ class Solution {
k = j;
}
}
public void swap (int nums[], int i, int j) {
int temp = nums[i];
nums[i] = nums[j];
nums[j] = temp;
void swap(int[] nums, int i, int j) {
int temp = nums[rollBack(i)];
nums[rollBack(i)] = nums[rollBack(j)];
nums[rollBack(j)] = temp;
}
}
@ -272,39 +272,40 @@ class Solution {
Python Code:
```python
def rollBack(i: int):
return i - 1
def sortArray(nums: list)->list:
leng = len(nums)
a = [0] + nums
# 下沉建堆
for i in range(int(leng / 2), 0, -1):
sink(a, i, leng)
sink(nums, i, leng)
k = leng
# 排序
while k > 1:
swap(a, 1, k)
swap(nums, 1, k)
k -= 1
sink(a, 1, k)
sink(nums, 1, k)
for i in range(1, leng + 1):
nums[i - 1] = a[i]
return nums
def swap(nums: list, i: int, j: int):
temp = nums[i]
nums[i] = nums[j]
nums[j] = temp
temp = nums[rollBack(i)]
nums[rollBack(i)] = nums[rollBack(j)]
nums[rollBack(j)] = temp
def sink(nums: list, k: int, end: int):
while 2 * k <= end:
j = 2 * k
if j + 1 <= end and nums[j + 1] > nums[j]:
if j + 1 <= end and nums[rollBack(j + 1)] > nums[rollBack(j)]:
j += 1
if nums[j] > nums[k]:
if nums[rollBack(j)] > nums[rollBack(k)]:
swap(nums, j, k)
else:
break
k = j
```
好啦，堆排序我们就到这里啦，是不是搞定啦，总的来说堆排序比其他排序算法稍微难理解一些，重点就是建堆，而且应用比较广泛，大家记得打卡呀。