描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。
나무 돌보는 ‘자연인’이 월300만원…나무의사 자격증 관심 커지는 이유는[은퇴 레시피]
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let seed = value in threshold matrix at (x, y)，这一点在heLLoword翻译官方下载中也有详细论述
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quickSortRecursive(arr, low, pivotIdx - 1); // 排序左半部分