https://www.acmicpc.net/problem/14467
Case1.
8
3 1
3 0
6 0
2 1
4 1
3 0
4 0
3 1
예제를 이해하고 코드로 옮겨봅시다.
Case1.
1 2 3 4 5 6 7 8 9 10
1 => just record
0 => answer++
0
1
1
0 => continue
0 => answer++
1 => answer++⬇️
const filePath = process.platform === 'linux' ? '/dev/stdin' : './input.txt';
const input = require('fs')
.readFileSync(filePath)
.toString()
.trim()
.split('\n');
const N = input[0];
let check = Array(11).fill(-1);
let answer = 0;
for (let i = 1; i <= N; i++) {
const tmp = input[i].split(' ');
const cow = Number(tmp[0]);
const record = Number(tmp[1]);
if (check[cow] === -1) {
check[cow] = record;
} else if (check[cow] !== record) {
check[cow] = record;
answer += 1;
}
}
console.log(answer);