AcWing 787. 归并排序
原题链接
简单
作者:
牛奶小柒Luke
,
2021-03-03 00:21:14
,
所有人可见
,
阅读 286
//分治递归思想
#include <iostream>
using namespace std;
const int N = 1e5 + 10;
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);//排序过程
int k = 0,i = l,j = mid + 1;
while(i <= mid && j <= r){//归并过程
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];//放入原来数组
}
int main(){
int n;
cin >> n;
for(int i = 0;i < n;++i){
cin >> q[i];
}
merge_sort(q,0,n - 1);
for(int i = 0;i < n;++i){
cout << q[i] << ' ';
}
cout << endl;
return 0;
}