靠谱题解，求赞

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    for(int i=0;i*i<=n;i++)
        for(int j=0;i*i+j*j<=n;j++)
            for(int k=0;i*i+j*j+k*k<=n;k++){
                int t=n-i*i-j*j-k*k;
                int m=sqrt(t);
                if(m*m==t){
                    cout<<i<<" "<<j<<" "<<k<<" "<<m<<endl;
                    return 0;
                }
            }
    return 0;[:星星眼][:星星眼]
}