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摘要： 题目: Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should 阅读全文

摘要： 题目: Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For 阅读全文

摘要： 题目：Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you ca... 阅读全文

摘要： 题目： Note: This is an extension of House Robber. After robbing those houses on that street, the thief has found himself a new place for his thievery so 阅读全文

摘要： 题目：Given a 2D board and a list of words from the dictionary, find all words in the board.Each word must be constructed from letters of sequentially ad... 阅读全文

摘要： 题目： Design a data structure that supports the following two operations: search(word) can search a literal word or a regular expression string containi 阅读全文

摘要： 题目： There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you ha 阅读全文

摘要： 分硬币问题是一个很有意思的问题，一般可以用recursive或者dp来解决。Reference里面acm之家的文章分析得很好，下面我自己再重复一边这个过程。这道题也可以联想到其他dp过程。 题目很简单: 给定一堆硬币coins[]， 数量管够，硬币有m种不同的面值，求组成 n 元钱有多少种不同的方法 阅读全文

摘要： 1. Two Sum 2. Add Two Numbers 3. Longest Substring Without Repeating Characters 4. Median of Two Sorted Arrays 5. Longest Palindromic Substring 6. Zig 阅读全文

摘要： 四五年前就想好好学习Python和Javasctipt，一直拖到今日。 前阵投了些简历，不少公司都问到，除了现有的东西还会不会Python和Javascript。痛定思痛， 要快速了解一下语法，数据结构，常用发。以后再慢慢理解。 阅读全文