求助

qsbb @ 2024-08-27 19:47:14

#include<bits/stdc++.h>
using namespace std;
int n;
int a[1000010];
int main(){
    cin >> n;
    for(int i = 0; i < n; i++) cin >> a[i];
    int num = 0;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j--){
            int k = sqrt(a[i] + a[j]);
            if(a[i] + a[j] == k * k){
                num ++;
            }
        }
    }
    cout << num;
}

by Dress @ 2024-08-27 20:00:08

@just01 已AC求关QWQ

#include<bits/stdc++.h>
using namespace std;
int n;
int a[1000010];
int main(){
    cin >> n;
    for(int i = 0; i < n; i++) cin >> a[i];
    int num = 0;
    for(int i = 0; i < n; i++){
        for(int j = i + 1; j < n; j++){//j = 0 -> j = i + 1  j-- -> j++
            int k = sqrt((int) a[i] + a[j]);//sqrt(a[i] + a[j]) -> sqrt((int) a[i] + a[j])
            if(sqrt(a[i] + a[j]) == k){//a[i] + a[j] == k * k -> sqrt(a[i] + a[j]) == k
                num ++;
            }
        }
    }
    cout << num;
}

AC记录

by qsbb @ 2024-08-28 18:05:47

谢谢

by qsbb @ 2024-08-28 18:06:11

@Dress 谢谢

by cuixizhou @ 2024-09-06 20:52:37

@just01 求关+1

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,a[1005],g=0;
    cin>>n;
    for(int i=1;i<=n;i++) cin>>a[i];
    for(int i=1;i<=n;i++) for(int j=i+1;j<=n;j++) if(int(sqrt(a[i]+a[j]))==sqrt(a[i]+a[j]*1.0)) g++;
    cout<<g;
    return 0;
}