AcWing 787. 归并排序
原题链接
简单
作者:
求Accept
,
2021-02-09 21:02:16
,
所有人可见
,
阅读 278
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5+10;
int q[N],tmp[N]; //tmp[N]存储排序结果
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(i <= mid) tmp[k ++] = q[i ++];
while(j <= r) tmp[k ++] = q[j ++];
for(int i = l, j = 0; i <= r; i ++, j ++) q[i] = tmp[j]; //将tmp[N]重新赋值给q[N]
}
int main()
{
int n;
scanf("%d\n",&n);
for(int i = 0; i < n; i ++) scanf("%d", &q[i]);
merge_sort(q,0,n-1);
for(int i = 0; i < n; i ++) printf("%d ",q[i]);
return 0;
}