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摘要： Given two strings A and B, find the minimum number of times A has to be repeated such that B is a substring of it. If no such solution, return -1. For 阅读全文

摘要： 田忌赛马，大致题意是田忌和国王赛马，赢一局得200元，输一局输掉200元，平局则财产不动。 先输入一个整数N，接下来一行是田忌的N匹马，下一行是国王的N匹马。当N为0时结束。 此题为贪心算法解答，有两种思路。 思路二： 1、开始也是先排序，可以使用sort快排； 2、然后将田忌最大的马与国王进行比较 阅读全文

摘要： Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2 阅读全文

摘要： You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types: Each round's operation is permane 阅读全文

摘要： You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is. Each time 阅读全文

摘要： There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every 阅读全文

摘要： Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Input: "aba" Output: True Exa 阅读全文

摘要： Implement a magic directory with buildDict, and search methods. For the method buildDict, you'll be given a list of non-repetitive words to build a di 阅读全文

摘要： Given an unsorted array of integers, find the length of longest continuous increasing subsequence. Example 1: Example 2: Note: Length of the array wil 阅读全文

摘要： 题意大概是： 一个数比如242，把所有数字分成两组，而且两组的和相等，那么这个数就是神奇数，此时242，能够分成{2,2}和{4}，所以242是神奇数。 题目要求输入n和m求[n,m]区间内神奇数的个数。 思路： 对于任意一个数字，将每一位上的数字保存到数组里，并求所有位上的数字的和sum。然后使用 阅读全文