Envío 2392

Código

//
#include <bits/stdc++.h>
using namespace std;
#define INF 1000000000
#define MOD 1000000007
#define PI 3.14159265
#define EPS 1e-9
#define Pi acos(-1.0)
typedef pair<int, int> ii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<ll,ll> pll;
#define forr(i,a,b) for(int i=(a); i<(b); i++)
#define clean(arr,val) memset(arr,val,sizeof(arr))
#define forn(i,n) forr(i,0,n)
#define PB push_back
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vpll;

/*CODE START HERE*/

int n, sum, aux;
int m[105][105];
bool sol;

int main(){
    ios::sync_with_stdio(0);
    sol = true;
    cin >> n;
    forn(i,n){
        forn(j,n){
            cin >> m[i][j];
        }
    }
    sum = 0;
    forn(i,n){
        sum += m[i][0];
    }

    forn(i,n){
        aux = 0;
        //Filas
        forn(j,n){
            aux += m[i][j];
        }
        if(aux != sum)
            sol = false;
        
        //Col
        aux = 0;
        forn(j,n){
            aux += m[j][i]; 
        }
        if(aux != sum)
            sol = false;
    }

    //Diag
    aux = 0;
    forn(i,n){
        aux += m[i][i];
    }
    if(aux != sum)
        sol = false;

    aux = 0;
    forn(i,n){
        aux += m[n-i-1][i];
    }
    if(aux != sum){
        sol = false;
    }

    if(sol){
        cout << "Yes\n";
    }else{
        cout << "No\n";
    }
    return 0;
}