function icecreamParlor(m, arr) {
  for (let i = 0; i < arr.length; i++) {
    const remainder = m - arr[i];
    const secondIndex = arr.indexOf(remainder);
    if (secondIndex != -1 && secondIndex != i) {
      return [i+1, secondIndex+1].sort((a,b) => a - b);
    }
  }
}