최대 매출

const solution = (target, arr) => {
  const limit = arr.length;
  let leftPointer = 0;
  let sum = 0;
  let max = 0;
  for (let rightPointer = 0; rightPointer < limit; rightPointer++) {
    sum += arr[rightPointer];
    if (rightPointer - leftPointer == 3) {
      sum -= arr[leftPointer++];
      if (sum > max) max = sum;
    }
  }
  return max;
};

const result = solution(3, [12, 15, 11, 20, 25, 10, 20, 19, 13, 15]);
console.log(result);