Envío 5079

Código

#include <iostream>
#include <vector>

using namespace std;

int main () {
  int N, n;
  bool isMagic = true;

  cin >> N;
  n = N;
  vector<vector<int> > matriz(N, vector<int>(N));
  while (n--) {
    for (int i = 0; i < N; i++) {
      cin >> matriz[n][i];
    }
  }

  //vertical-horizontal check
  for (int i = 0; i < N; i++) {
    int verticalSum = 0, horizontalSum = 0;
    for (int j = 0; j < N; j++) {
      horizontalSum += matriz[i][j];
      verticalSum += matriz[j][i];
    }
    if (horizontalSum != verticalSum) {
      isMagic = false;
      break;
    }
  }

  // diagonal check 
  int diagonal1 = 0, diagonal2 = 0;
  for (int i = 0, j = N-1; i < N; i++, j--) {
    diagonal1 += matriz[i][i];
    diagonal2 += matriz[i][j];
  }

  if (!isMagic || diagonal1 != diagonal2) {
    cout << "No" << endl;
  } else {
    cout << "Yes" << endl;
  }
  return 0;
}