Iteration1.js

"use strict";

process.stdin.resume();
process.stdin.setEncoding("utf-8");

let inputString = "";
let currentLine = 0;

process.stdin.on("data", (inputStdin) => {
  inputString += inputStdin;
});

process.stdin.on("end", (_) => {
  inputString = inputString
    .trim()
    .split("\n")
    .map((string) => {
      return string.trim();
    });

  main();
});

function readLine() {
  return inputString[currentLine++];
}

function getCount(objects) {
  let count = 0;
  for (let o of objects) if (o.x == o.y) count++;
  return count;
}
/*
 * Using a for-of, we can iterate on the objects in the array.
 */

function main() {
  const n = +readLine();
  let objects = [];

  for (let i = 0; i < n; i++) {
    const [a, b] = readLine().split(" ");

    objects.push({ x: +a, y: +b });
  }

  console.log(getCount(objects));
}