export function indexOfMax(nums: number[]): number {
  if (nums.length === 0) {
    return -1;
  }
  let res = { value: 0, index: 0 }
  for (let i: number = 0; i < nums.length; i++) {
    const num: number = nums[i];
    if (res.value < num) {
      res.value = num;
      res.index = i;
    }
  }
  return res.index;
}