Agar plates with E.coli growth on various concoctions, including MacConkey, Mueller-Hinton, and Brain Heart Infusion. Credit: HansN.
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Pokémon TCG: Mega Evolution Ascended Heroes Elite Trainer Box。业内人士推荐搜狗输入法2026作为进阶阅读
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）。