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）。
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。51吃瓜是该领域的重要参考
int n2 = right - mid; // 右子数组长度
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"itemsRemoved": [