归并排序非递归c++
时间: 2023-11-12 15:56:43 浏览: 54
归并排序的非递归实现需要借助栈,具体实现步骤如下:
1. 首先将待排序的序列分成若干个长度为1的子序列;
2. 然后将相邻的子序列进行合并,得到长度为2的有序子序列;
3. 不断重复第2步,直到得到一个长度为n的有序序列。
以下是C语言的非递归归并排序实现代码:
```c
void merge_sort(int arr[], int len)
{
int* a = arr;
int* b = (int*) malloc(len * sizeof(int));
int seg, start;
for (seg = 1; seg < len; seg += seg) {
for (start = 0; start < len; start += seg + seg) {
int low = start, mid = min(start + seg, len), high = min(start + seg + seg, len);
int k = low;
int start1 = low, end1 = mid;
int start2 = mid, end2 = high;
while (start1 < end1 && start2 < end2)
b[k++] = a[start1] < a[start2] ? a[start1++] : a[start2++];
while (start1 < end1)
b[k++] = a[start1++];
while (start2 < end2)
b[k++] = a[start2++];
}
int* temp = a;
a = b;
b = temp;
}
if (a != arr) {
int i;
for (i = 0; i < len; i++)
b[i] = a[i];
b = a;
}
free(b);
}
```
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