AcWing 787. 归并排序
原题链接
简单
作者:
daydayup_6
,
2021-02-06 17:24:59
,
所有人可见
,
阅读 300
#include <iostream>
using namespace std;
const int N = 1e5 + 10;
int n;
int q[N], tmp[N];
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) //加等号,每个数都要比
{
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];
}
int main()
{
scanf("%d", &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;
}