neps198.cpp

/*
 * Contest : Neps
 * Problem : 198 - Quadrado Mágico 3x3
 * Link    : https://neps.academy/br/exercise/198
 */

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#define fastio ios::sync_with_stdio(0); cin.tie(0);

int main() {
  fastio

  int n = 3;
  int diagP = 0, diagS = 0, mat[n][n], lin[n] = {0}, col[n] = {0};

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      cin >> mat[i][j];

      lin[i] += mat[i][j];
      col[j] += mat[i][j];

      if (i == j) diagP += mat[i][j];
      if (i + j == n - 1) diagS += mat[i][j];
    }
  }

  for (int i = 0; i < n; ++i) {
    if (lin[i] != diagP || col[i] != diagP) {
      cout << "NAO\n";
      return 0;
    }
  }
  if (diagS != diagP) cout << "NAO\n";
  else cout << "SIM\n";

  return 0;
}