# 240514

문제 : [약수의 개와 덧셈](https://school.programmers.co.kr/learn/courses/30/lessons/77884)\
난이도 : Lv.1\
설명 :

> 두 정수 left와 right가 매개변수로 주어집니다. left부터 right까지의 모든 수들 중에서, 약수의 개수가 짝수인 수는 더하고, 약수의 개수가 홀수인 수는 뺀 수를 return 하도록 solution 함수를 완성해주세요.

## 풀이

```javascript
function solution(left, right) {
    let answer = 0

    for(let i = left; i <= right; i++) {
        let count = 0;

        for(let j = 1; j <= i; j++) {
            if(i % j === 0) {
                count++
            }
        }

        if (count % 2 === 0) {
            answer += i;
        } else {
            answer -= i;
        }    
    }

    return answer
}
```

## 👀 다른 사람 풀이

```javascript
function solution(left, right) {
    var answer = 0;
    for (let i = left; i <= right; i++) {
        if (Number.isInteger(Math.sqrt(i))) {
            answer -= i;
        } else {
            answer += i;
        }
    }
    return answer;
}
```


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