业精于勤，荒于嬉

题目链接：http://hihocoder.com/problemset/problem/1082?sid=791045题目： fjxmlhx每天都在被沼跃鱼刷屏，因此他急切的找到了你希望你写一个程序屏蔽所有句子中的沼跃鱼(“marshtomp”，不区分大小写)。为了使句子不缺少成分，统一换成 “fjxmlhx” 。输入 输入包括多行。 每行是一个字符串，长度不超过200。 一行的末尾与下一

题目链接：http://hihocoder.com/problemset/problem/1094题目： 描述 Little Hi gets lost in the city. He does not know where he is. He does not know which direction is north.Fortunately, Little Hi has a map of th

题目链接：http://hihocoder.com/problemset/problem/1051题目： 描述 小Ho给自己定了一个宏伟的目标：连续100天每天坚持在hihoCoder上提交一个程序。100天过去了，小Ho查看自己的提交记录发现有N天因为贪玩忘记提交了。于是小Ho软磨硬泡、强忍着小Hi鄙视的眼神从小Hi那里要来M张”补提交卡”。每张”补提交卡”都可以补回一天的提交，将原本没有提交

题目链接：https://leetcode.com/problems/convert-a-number-to-hexadecimal/题目：Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used

题目链接：https://leetcode.com/contest/7/problems/longest-palindrome/题目： Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with t

题目链接：https://leetcode.com/contest/7/problems/valid-word-abbreviation/题目： Given a non-empty string s and an abbreviation abbr, return whether the string matches with the given abbreviation.A string suc

题目链接：https://leetcode.com/contest/7/problems/split-array-largest-sum/]题目：Given an array which consists of non-negative integers and an integer m, you can split the array into m non-empty con

题目链接：https://leetcode.com/contest/5/problems/binary-watch/题目： A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59).Each LED

题目链接：https://leetcode.com/contest/5/problems/nth-digit/题目： Find the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, … Note: n is positive and will fit within the range

题目链接：https://leetcode.com/contest/5/problems/remove-k-digits/题目： Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possib

题目链接：http://hihocoder.com/problemset/problem/1049题目描述：没错！小Ho在这一周遇到的问题便是：给出一棵二叉树的前序和中序遍历的结果，还原这棵二叉树并输出其后序遍历的结果。输入每个测试点（输入文件）有且仅有一组测试数据。每组测试数据的第一行为一个由大写英文字母组成的字符串，表示该二叉树的前序遍历

题目：小Hi最近在玩一个字符消除游戏。给定一个只包含大写字母"ABC"的字符串s，消除过程是如下进行的：1)如果s包含长度超过1的由相同字母组成的子串，那么这些子串会被同时消除，余下的子串拼成新的字符串。例如"ABCCBCCCAA"中"CC","CCC"和"AA"会被同时消除，余下"AB"和"B"拼成新的字符串"ABB"。2)上述消除会反复一轮一轮进行，直到新的字符串不包含

题目懒得贴了。。http://hihocoder.com/problemset/problem/1014思路：easy。。trie树。。。。不同点在于。。为了查询前缀效率更高，在该树中添加节点时，在添加过程中的节点都记录一下以该节点为父节点有多少个子节点。。。。。（说的我头都晕了，其实就是add word时，从root到新节点经过的路径上的每个节点记录值都加一）

题目链接：http://hihocoder.com/problemset/problem/1366思路：easy ，不解释算法：import java.util.HashSet;import java.util.Scanner;import java.util.Set;/** * http://hihocoder.com/problemset/problem

题目链接：http://hihocoder.com/problemset/problem/1141题目：我们可以看到，船默认排序是以等级为参数。但实际上一个船的火力值和等级的关系并不大，所以会存在A船比B船等级高，但是A船火力却低于B船这样的情况。比如上图中77级的飞龙改二火力就小于55级的夕立改二。现在Nettle将按照等级高低的顺序给出所有船的火力值，请你计算出一共有多少对船满

题目链接：https://leetcode.com/problems/lexicographical-numbers/ 题目： Given an integer n, return 1 - n in lexicographical order.For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9].Please optimiz

题目链接：https://leetcode.com/problems/shortest-palindrome/ 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 palindrom

题目链接：https://leetcode.com/contest/4/problems/evaluate-division/题目：Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (flo

题目链接：题目：Given an array of integers A and let n to be its length.Assume Bk to be an array obtained by rotating the array A k positions clock-wise, we define a "rotation function" F on A as

题目链接：https://leetcode.com/contest/4/problems/integer-replacement/题目：Given a positive integer n and you can do operations as follow:If n is even, replace n with n/2.If n is odd, you can

题目链接：https://leetcode.com/contest/4/problems/random-pick-index/题目：Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that t

题目链接：https://leetcode.com/problems/range-sum-query-mutable/题目：Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.The update(i, val) functi

题目链接：https://leetcode.com/problems/utf-8-validation/题目：A character in UTF8 can be from 1 to 4 bytes long, subjected to the following rules:For 1-byte character, the first bit is a 0, follo

题目链接：https://leetcode.com/problems/longest-substring-with-at-least-k-repeating-characters/题目：Find the length of the longest substring T of a given string (consists of lowercase letters only) s

题目链接：https://leetcode.com/contest/3/problems/decode-string/题目：Given an encoded string, return it's decoded string.The encoding rule is: k[encoded_string], where the encoded_string inside the s

题目链接：https://leetcode.com/contest/3/problems/is-subsequence/题目：Given a string s and a string t, check if s is subsequence of t.You may assume that there is only lower case English letters

题目链接：https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/题目：Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specifi

题目链接：https://leetcode.com/problems/longest-absolute-file-path/题目：Suppose we abstract our file system by a string in the following manner:The string "dir\n\tsubdir1\n\tsubdir2\n\t\tfile.ext

题目链接：https://leetcode.com/problems/mini-parser/题目：Given a nested list of integers represented as a string, implement a parser to deserialize it.Each element is either an integer, or a list -

题目链接：https://leetcode.com/problems/shuffle-an-array/题目：Shuffle a set of numbers without duplicates.Example:// Init an array with set 1, 2, and 3.int[] nums = {1,2,3};Solution solution

题目链接：https://leetcode.com/problems/ransom-note/题目：Given
 an 
arbitrary
 ransom
 note
 string 
and 
another 
string 
containing 
letters from
 all 
the 
magazines,
 write 
a 
function 
that 
wi

题目链接：https://leetcode.com/problems/linked-list-random-node/题目：Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability of being c

题目链接：https://leetcode.com/problems/insert-delete-getrandom-o1-duplicates-allowed/题目：Design a data structure that supports all following operations in average O(1) time.Note: Duplicate elemen

题目链接：https://leetcode.com/problems/insert-delete-getrandom-o1/题目：Design a data structure that supports all following operations in average O(1) time.insert(val): Inserts an item val to

题目链接：https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/题目：Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest eleme

Leetcode缺少一个 出现新题目就发邮件提醒用户的功能，所以写了一个脚本。脚本有两个函数：检查leet网站是否有新题目，并且题目是能做的、没加锁的；发邮件提醒用户。网站解析用的是beautifulSoup 所以需要预先安装bs4模块脚本写完需要上传到云主机上，这里简单起见 我用的是实验室的服务器，上传并运行该脚本。这里有个小问题要解决，ssh运行python断开终端后会杀死该进

题目链接：https://leetcode.com/problems/combination-sum-iv/题目：Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a pos

题目链接：题目： We are playing the Guess Game. The game is as follows:I pick a number from 1 to n. You have to guess which number I picked.Every time you guess wrong, I’ll tell you whether the number I picke

题目链接：https://leetcode.com/problems/wiggle-subsequence/题目： A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negati

题目链接：https://leetcode.com/problems/wildcard-matching/题目：Implement wildcard pattern matching with support for '?' and '*'.'?' Matches any single character.'*' Matches any sequence of charact