AcWing 787. 归并排序
原题链接
简单
作者:
阿P
,
2021-03-18 19:26:58
,
所有人可见
,
阅读 294
#include <iostream>
using namespace std;
int n, q[100010], tmp[100010];
void merge_sort(int q[], int l, int r)
{
if(l >= r) return;
int mid = (l + r) >> 1;
merge_sort(q, l, mid);
merge_sort(q, mid+1, r);
int k = 0, i = l, j = mid + 1;
while(i <= mid && j <= r)
{
if(q[i] <= q[j]) tmp[k++] = q[i++];
else tmp[k++] = q[j++];
}
while(j <= r) tmp[k++] = q[j++];
while(i <= mid) tmp[k++] = q[i++];
for(int i=l,j=0;i<=r;i++,j++) q[i] = tmp[j];
}
int main()
{
cin >> n;
for(int i=0;i<n;i++) cin >> q[i];
merge_sort(q, 0, n-1);
for(int i=0;i<n;i++) cout << q[i] << " ";
return 0;
}