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摘要： Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have 阅读全文

摘要： Given two binary strings, return their sum (also a binary string). For example, a = "11" b = "1" Return "100". 思路： 模拟加法时候的情形，从最后一位开始进行相加，注意进位的情况。 阅读全文