快速 || 归并 排序模板
#include <iostream>
using namespace std;
int n ;
const int N = 1e6 + 5;
int a[N];
void quick_sort(int a[], int l , int r ){
if(l >= r) return;
int i = l - 1, j = r + 1, x = a[l];
while(i < j){
do i++; while(a[i] < x);
do j--; while(a[j] > x);
if(i < j) swap(a[i], a[j]);
}
quick_sort(a, l, j);
quick_sort(a, j + 1, r);
}
int main(){
scanf("%d", &n);
for(int i = 0; i < n; i++) scanf("%d", &a[i]);
quick_sort(a, 0, n - 1);
for(int i = 0 ;i < n; i++) printf("%d ", a[i]);
return 0;
}
#include <iostream>
using namespace std;
const int N = 1e5 + 5;
int a[N], temp[N];
void merge_sort(int a[], int l, int r){
if(l >= r) return;
int mid = (l + r) >> 1;
merge_sort(a, l, mid);
merge_sort(a, mid + 1, r);
int i = l, j = mid + 1, k = 0;
while(i <= mid && j <= r){
if(a[i] <= a[j] ) temp[k++] = a[i++];
else temp[k++] = a[j++];
}
while(i <= mid) temp[k++] = a[i++];
while(j <= r) temp[k++] = a[j++];
for(int i = l, j = 0; i <= r; i++, j++) a[i] = temp[j];
}
int main(){
int n ;
cin >> n;
for(int i = 0; i < n; i++) cin >> a[i];
merge_sort(a, 0, n - 1);
for(int i = 0; i < n; i++) cout << a[i] << " ";
return 0;
}