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There are 2N people a company is planning to interview. The cost of flying the i-th person to city A is costs[i][0], and the cost of flying the i-th p 阅读全文
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There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have direct prerequisites, for example, to take course 0 you 阅读全文
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Given preorder and inorder traversal of a tree, construct the binary tree. You may assume that duplicates do not exist in the tree. Example Given in-o 阅读全文
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Return the lexicographically smallest subsequence of text that contains all the distinct characters of text exactly once. Example 1: Input: "cdadabcc" 阅读全文
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Given many words, words[i] has weight i. Design a class WordFilter that supports one function, WordFilter.f(String prefix, String suffix). It will ret 阅读全文
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Given a char array representing tasks CPU need to do. It contains capital letters A to Z where different letters represent different tasks. Tasks coul 阅读全文
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Given a binary array, find the maximum length of a contiguous subarray with equal number of 0 and 1. Example 1: Input: [0,1] Output: 2 Explanation: [0 阅读全文
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Given an array of integers and a number k, the majority number is the number that occurs more than 1/k of the size of the array, find all the majority 阅读全文
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Given an integer array of size n, find all elements that appear more than ⌊ n/3 ⌋ times. Note: The algorithm should run in linear time and in O(1) spa 阅读全文
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Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the 阅读全文