인프런 커뮤니티 질문&답변

function solution(m, arr) {
  let [left, right] = [0, 1];
  let sum = arr[left];
  let result = 0;

  while (right <= arr.length) {
    if (sum < m) {
      sum += arr[right++];
    } else if (sum > m) {
      sum -= arr[left++];
    } else {
      sum -= arr[left++];
      result++;
    }
  }
  return result;
}