leetcode - 随笔分类(第2页) - xiaoba1203

leetcode 208. Implement Trie (Prefix Tree) 设计前缀树 ---------- java

摘要：Implement a trie with insert, search, and startsWith methods. Note:You may assume that all inputs are consist of lowercase letters a-z. 设计一个前缀树，包括inse 阅读全文

posted @ 2017-03-28 10:28 xiaoba1203 阅读(129) 评论(0) 推荐(0)

leetcode 207. Course Schedule 课程计划 ---------- java

摘要：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 have t 阅读全文

posted @ 2017-03-27 19:48 xiaoba1203 阅读(1085) 评论(0) 推荐(0)

leetcode 206. Reverse Linked List 反转链表 ---------- java

摘要：Reverse a singly linked list. 阅读全文

posted @ 2017-03-25 13:33 xiaoba1203 阅读(476) 评论(0) 推荐(0)

leetcode 205. Isomorphic Strings 判断两个字符串能否互相转换 ---------- java

摘要：Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All occurrenc 阅读全文

posted @ 2017-03-24 18:52 xiaoba1203 阅读(228) 评论(0) 推荐(0)

leetcode 204. Count Primes 找出素数的个数 ---------- java

摘要：Description: Count the number of prime numbers less than a non-negative number, n. 找出小于n的素数个数。 1、用最淳朴的算法果然超时了。 2、埃拉托斯特尼筛法Sieve of Eratosthenes 我们从2开始遍阅读全文

posted @ 2017-03-24 18:11 xiaoba1203 阅读(480) 评论(0) 推荐(0)

leetcode 203. Remove Linked List Elements 删除链表中的某个值 ---------- java

摘要：Remove all elements from a linked list of integers that have value val. ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6Return: 1 --> 2 -- 阅读全文

posted @ 2017-03-24 17:33 xiaoba1203 阅读(147) 评论(0) 推荐(0)

leetcode 201. Bitwise AND of Numbers Range 求范围中，每一位都是1的数 ---------- java

摘要：Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 阅读全文

posted @ 2017-03-24 16:55 xiaoba1203 阅读(127) 评论(0) 推荐(0)

leetcode 200. Number of Islands 求岛的数量 ---------- java

摘要：Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen 阅读全文

posted @ 2017-03-24 15:33 xiaoba1203 阅读(453) 评论(0) 推荐(0)

leetcode 199. Binary Tree Right Side View 求所能看到的叶子节点 ---------- java

摘要：Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. For exa 阅读全文

posted @ 2017-03-24 12:51 xiaoba1203 阅读(131) 评论(0) 推荐(0)

leetcode 198. House Robber 求抢劫的最大金额 ---------- java

摘要：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文

posted @ 2017-03-24 12:39 xiaoba1203 阅读(269) 评论(0) 推荐(0)

leetcode 191. Number of 1 Bits 求二进制1的个数 ---------- java

摘要：Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit 阅读全文

posted @ 2017-03-24 11:20 xiaoba1203 阅读(129) 评论(0) 推荐(0)

leetcode 190. Reverse Bits （int）数字旋转 ---------- java

摘要：Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), retur 阅读全文

posted @ 2017-03-24 11:11 xiaoba1203 阅读(204) 评论(0) 推荐(0)

leetcode 189. Rotate Array 数组旋转 ---------- java

摘要：Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. 就是把阅读全文

posted @ 2017-03-23 23:02 xiaoba1203 阅读(293) 评论(0) 推荐(0)

leetcode 187. Repeated DNA Sequences 求重复的DNA串 ---------- java

摘要：All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes useful to 阅读全文

posted @ 2016-12-21 21:15 xiaoba1203 阅读(195) 评论(0) 推荐(0)

leetcode 186. Reverse Words in a String II 旋转字符数组 ---------- java

摘要：Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters. The input string does not contain lea 阅读全文

posted @ 2016-12-11 17:10 xiaoba1203 阅读(384) 评论(0) 推荐(0)

leetcode 179. Largest Number 求最大组合数 ---------- java

摘要：Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed n 阅读全文

posted @ 2016-12-08 12:15 xiaoba1203 阅读(418) 评论(0) 推荐(0)

✡ leetcode 174. Dungeon Game 地牢游戏 --------- java

摘要：The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists of M x N rooms laid out in a 阅读全文

posted @ 2016-12-08 00:03 xiaoba1203 阅读(1101) 评论(0) 推荐(0)

✡ leetcode 173. Binary Search Tree Iterator 设计迭代器（搜索树）--------- java

摘要：Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the n 阅读全文

posted @ 2016-12-07 17:59 xiaoba1203 阅读(660) 评论(0) 推荐(0)

✡ leetcode 172. Factorial Trailing Zeroes 阶乘中的结尾0个数--------- java

摘要：Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 主要是思考清楚计算过程：将一个数进行因式分解，阅读全文

posted @ 2016-11-30 21:52 xiaoba1203 阅读(124) 评论(0) 推荐(0)

✡ leetcode 171. Excel Sheet Column Number 字母转换为数字 --------- java

摘要：Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example: 很简阅读全文

posted @ 2016-11-30 17:28 xiaoba1203 阅读(209) 评论(0) 推荐(0)

随笔分类 - leetcode

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