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Problem Follow up for "Remove Duplicates":What if duplicates are allowed at most twice?...

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题目 Given a string S and a string T, find the minimum window in S which will contain all...

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题目 Given an array with n objects colored red, white or blue, sort them so that objects ...

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题目 Write an efficient algorithm that searches for a value in an m x n matrix. This matr...

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题目 Given a mxn matrix, if an element is 0, set its entire row and column to 0. Do it in...

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题目 Given two words word1 and word2, find the minimum number of steps required to conver...

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题目 Given a triangle, find the minimum path sum from top to bottom. Each step you may mo...

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题目 Given an absolute path for a file (Unix-style), simplify it.For example,path = "/hom...

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题目 You are climbing a stair case. It takes n steps to reach to the top. Each time you c...

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题目 Implement int sqrt(int x). Compute and return the square root of x. 分析 主要思想很简单，就用二分法...

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题目 Given an array of words and a length L, format the text such that each line has exac...

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题目 Given two binary strings, return their sum (also a binary string). For example,a = "...

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题目 Given a non-negative integer represented as a non-empty array of digits, plus one to...

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题目 Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc"...

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题目 Given a m x n grid filled with non-negative numbers, find a path from top left to bo...

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题目 Follow up for "Unique Paths": Now consider if some obstacles are added to the grids....

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题目 A robot is located at the top-left corner of a m x n grid (marked 'Start' in the dia...

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题目 Given a list, rotate the list to the right by k places, where k is non-negative. For...