neps530.cpp

/*
 * Contest : Neps
 * Problem : 530 - O Mar não está para Peixe
 * Link    : https://neps.academy/br/exercise/530
 */

#include <iostream>
using namespace std;

#define fastio ios::sync_with_stdio(0); cin.tie(0);
const int TAM=101;

int main() {
  fastio

  int mar[TAM][TAM];
  for (int i = 0; i < TAM; i++)
    for (int j = 0; j < TAM; j++) mar[i][j] = 0;

  int num_redes; cin >> num_redes;

  while (num_redes--) {
    int xi, xf, yi, yf;
    cin >> xi >> xf >> yi >> yf;

    for (int i = xi; i < xf; ++i)
      for (int j = yi; j < yf; ++j) mar[i][j] = 1;
  }

  int area = 0;
  for (int i = 0; i < TAM; i++)
    for (int j = 0; j < TAM; j++)
      if (mar[i][j] == 1) area++;

  cout << area << endl;

  return 0;
}