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Problem:Given an array of numbersnums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two el... 阅读全文
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Problem:Given two wordsword1andword2, find the minimum number of steps required to convertword1toword2. (each operation is counted as 1 step.)You have... 阅读全文
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Problem:A message containing letters fromA-Zis being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded messa... 阅读全文
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Problem:Given a 2D board containing'X'and'O', capture all regions surrounded by'X'.A region is captured by flipping all'O's into'X's in that surrounde... 阅读全文
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Problem:Givennnon-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in th... 阅读全文