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二进制求和 给你两个二进制字符串,返回它们的和(用二进制表示)。 输入为 非空 字符串且只包含数字1和0。 示例 输入: a = "11", b = "1" 输出: "100" 输入: a = "1010", b = "1011" 输出: ...
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一次编辑 字符串有三种编辑操作:插入一个字符、删除一个字符或者替换一个字符。给定两个字符串,编写一个函数判定它们是否只需要一次(或者零次)编辑。 示例 输入: first = "pale" second = "ple" 输出: True 输...
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