Envío 4957

Código

/// Write by Daniel Perez .PERAPRO
#include<bits/stdc++.h>

using namespace std;
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define pb push_back
#define ff first
#define ss second
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
using vi=vector<int>;
using vl=vector<ll>;
using pii=pair<int,int>;
char el = '\n';
char esp = ' ';

template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

ostream& operator<<(ostream& os, const vector<int> &v){
    for(auto const &i: v){
        os<<i<<" ";
    }
    os<<'\n';
    return os;
}
string yes="YES";
string no="NO";

const int N=105;

ll m[N][N];

ll rows[N];
ll columns[N];

ll diagonales[2];

int main(){
	fast_io;
	/*
 	freopen("input.txt","r",stdin);
    freopen("output.txt","w",stdout);
    */
    int n;
    cin>>n;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cin>>m[i][j];
        }
    }
    
    for(int i=0;i<n;i++) diagonales[0] += m[i][i];
    
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            rows[i] += m[i][j];
        }
    }
    
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            columns[i] += m[j][i];
        }
    }
    
    for(int i=0;i<n;i++){
        diagonales[1] += m[i][(n - 1 - i)];
    }
    
    int flag=1;
    int ans=diagonales[0];
    
    for(int i=0;i<n;i++){
        flag &= (rows[i] == ans && columns[i] == ans);
    }
    flag &= diagonales[1] == ans;
    
    if(flag)
        cout<<"Yes"<<el;
    else
        cout<<"No"<<el;
}

/*

*/