AcWing 787. 归并排序
原题链接
简单
作者:
今晚几点睡
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2025-01-03 23:00:46
,
所有人可见
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阅读 2
#include<iostream>
#include<vector>
using namespace std;
int n;
vector<int> q,tmp;
void merge_sort(vector<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 i = l, j = mid + 1, k = 0;
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( i = l, j = 0 ; i <= r ; i++, j++) q[i] = tmp[j];
}
int main(){
scanf("%d",&n);
q.resize(n);
tmp.resize(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;
}