随笔分类 - Leetcode
摘要：Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has a g
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摘要：Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between iand j equals
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摘要：There is a fence with n posts, each post can be painted with one of the k colors. You have to paint all the posts such that no more than two adjacent
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摘要：You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need t
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摘要：Given a sequence of words, check whether it forms a valid word square. A sequence of words forms a valid word square if the kth row and column read th
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摘要：Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3.
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摘要：Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n] inclu
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摘要：Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: Note: You may assume the
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摘要：You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take tu
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摘要：You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take tu
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摘要：Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window. For example, MovingAverage m = new M
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摘要：Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in t
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摘要：Given a binary tree Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL
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摘要：Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- w
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摘要：Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words. For
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摘要：Description: Count the number of prime numbers less than a non-negative number, n.
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摘要：1. Excel Sheet Column Number Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding c
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摘要：Invert a binary tree. to Trivia:This problem was inspired by this original tweet by Max Howell: Runtime: 0ms
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摘要：Find the sum of all left leaves in a given binary tree. Example: 3 / \ 9 20 / \ 15 7 There are two left leaves in the binary tree, with values 9 and 1
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摘要：Given an absolute path for a file (Unix-style), simplify it. For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c" click to show co
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