4
5
1 2
2 4
3 1
3 4
4 2

const graphsMain = () => {

    let lineReader = require('readline').createInterface({
        input: require('fs').createReadStream('file.in')
    });

    lineReader.on('line', function (line) {
        console.log('Line from file:', line);
    });
}

graphsMain();

#include <iostream>

using namespace std;

bool A[10][10];

int main() {
  int x, y, nodes, edges;
  cin >> nodes; // Number of nodes
  cin >> edges; // Number of edges
  for (int i = 0; i < edges; ++i) {
    cin >> x >> y;
    A[x][y] = true;
  }

  return 0;
}