随笔分类 - Uber
摘要：On a single threaded CPU, we execute some functions. Each function has a unique id between 0 and N-1. We store logs in timestamp order that describe w
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摘要：An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535). Given a coordinate (sr,
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摘要：We are given an array asteroids of integers representing asteroids in a row. For each asteroid, the absolute value represents its size, and the sign r
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摘要：Given a char array representing tasks CPU need to do. It contains capital letters A to Z where different letters represent different tasks.Tasks could
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摘要：Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000. Example 1:Input: "bbbab
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摘要：A group of friends went on holiday and sometimes lent each other money. For example, Alice paid for Bill's lunch for $10. Then later Chris gave Alice
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摘要：Given an array of integers nums and a positive integer k, find whether it's possible to divide this array into k non-empty subsets whose sums are all
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摘要：Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's
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摘要：Given a string s and a non-empty string p, find all the start indices of p's anagrams in s. Strings consists of lowercase English letters only and the
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摘要：Given a non-empty list of words, return the k most frequent elements. Your answer should be sorted by frequency from highest to lowest. If two words h
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摘要：Basic Calculator I Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parenthes
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摘要：Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) Yo
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摘要：The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calcul
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摘要：Path Sum I Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the g
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摘要：Determine whether an integer is a palindrome. Do this without extra space. 分析：把一个数倒过来，然后看两个数是否相同。 Reverse digits of an integer. Example1: x = 123, ret
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摘要：Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"], Return:
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摘要：Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ's undirected graph serialization: Nodes are labeled
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摘要：Design a data structure that supports all following operations in O(1) time. insert(val): Inserts an item val to the set if not already present.remove
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摘要：Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all mee
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摘要：Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Example 2:
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