AcWing 787. 归并排序
原题链接
简单
作者:
初静
,
2021-03-12 18:56:15
,
所有人可见
,
阅读 243
#include <iostream>
using namespace std;
const int N = 1e6 + 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) {
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;
}