随笔分类 - Level 3
摘要：Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), retur
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摘要：Flip Game I Problem Description: You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + a
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摘要：Word Pattern | Given a pattern and a string str, find if str follows the same pattern. Examples: Notes: solution: Split the string, and add the pair t
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摘要：Given a list of words and two words word1 and word2, return the shortest distance between these two words in the list. For example, Assume that words
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摘要：Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1. For example, 123 -> "One Hundre
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摘要：Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Return 0 if the array contains less than 2 el
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摘要：Given a non-empty array of integers, return the k most frequent elements. For example,Given [1,1,1,2,2,3] and k = 2, return [1,2]. 分析： http://blog.csd
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摘要：Given an Android 3x3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the total number of unlock patterns of the Android lock scre
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摘要：Given a binary tree, collect a tree's nodes as if you were doing this: Collect and remove all leaves, repeat until the tree is empty. Example:Given bi
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摘要：Implement function atoi to convert a string to an integer. If no valid conversion could be performed, a zero value is returned. If the correct value i
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摘要：Regular Expression Matching Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or
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摘要：Given an directed graph, a topological order of the graph nodes is defined as follow: For each directed edge A -> B in graph, A must before B in the o
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摘要：Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. Th
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摘要：Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integ
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摘要：Given an expression string array, return the Reverse Polish notation of this expression. (remove the parentheses) Given an expression string array, re
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摘要：Given n points on a 2D plane, find the maximum number of points that lie on the same straight line. Example Given 4 points: (1,2), (3,6), (0,0), (1,3)
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摘要：Given an interval list which are flying and landing time of the flight. How many airplanes are on the sky at most? Notice If landing and flying happen
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摘要：Given a set of n nuts of different sizes and n bolts of different sizes. There is a one-one mapping between nuts and bolts. Comparison of a nut to ano
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摘要：Given two 32-bit numbers, N and M, and two bit positions, i and j. Write a method to set all bits between i and j in N equal to M (e g , M becomes a s
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摘要：Given an integer matrix, find a submatrix where the sum of numbers is zero. Your code should return the coordinate of the left-up and right-down numbe
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