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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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Greater than: Every domino half in this space must add up to more than the number.
refuse to admit it has design flaws
Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00517-9