AcWing 787. 12 归并排序
原题链接
简单
作者:
QAQ_ning
,
2021-05-05 11:05:57
,
所有人可见
,
阅读 502
#include <iostream>
using namespace std;
const int N = 1e5 + 10;
int n;
int q[N];
int 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)
{
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 (k = 0, j = l; j <= r; j ++, k ++ ) q[j] = tmp[k];
}
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;
}