归并排序:
void _MergeSort(int* a, int begin, int end, int* tmp)
{
if (begin >= end)
return;
int mid = (begin + end) / 2;
// [begin, mid][mid+1, end]
_MergeSort(a, begin, mid, tmp);
_MergeSort(a, mid + 1, end, tmp);
// [begin, mid][mid+1, end]归并
int begin1 = begin, end1 = mid;
int begin2 = mid + 1, end2 = end;
int i = begin;
while (begin1 <= end1 && begin2 <= end2)
{
if (a[begin1] < a[begin2])
{
tmp[i++] = a[begin1++];
}
else
{
tmp[i++] = a[begin2++];
}
}
while (begin1 <= end1)
{
tmp[i++] = a[begin1++];
}
while (begin2 <= end2)
{
tmp[i++] = a[begin2++];
}
memcpy(a + begin, tmp + begin, sizeof(int) * (end - begin + 1));
}
void MergeSort(int* a, int n)
{
int* tmp = (int*)malloc(sizeof(int) * n);
if (tmp == NULL)
{
perror("malloc fail");
return;
}
_MergeSort(a, 0, n - 1, tmp);
free(tmp);
}
如果最大家有所帮助的话就支持一下吧!感谢大家!