1
/**
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 * @param {number} num
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 * @param {number} k
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 * @return {number}
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 */
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var minimumNumbers = function (num, k) {
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  if (num === 0) return 0;
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  if (num === k) return 1;
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  if (k === 0) return num % 10 !== 0 ? -1 : 1;
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  let x = Math.floor(num / k);
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  while (x >= 0) {
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    if (num - 10 * x > 0 && (num - 10 * x) % k === 0) {
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      return (num - 10 * x) / k;
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    }
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    x--;
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  }
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  return -1;
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};