import java.util.*; /** * Source : https://oj.leetcode.com/problems/word-ladder/ * * * Given two words (start and end), and a dictionary, find the length of shortest * transformation sequence from start to end, such that: * * Only one letter can be c…

Given two words (beginWord and endWord), and a dictionary, find the length of shortest transformation sequence from beginWord to endWord, such that: Only one letter can be changed at a time Each intermediate word must exist in the dictionary For exam…

利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.com/problems/valid-parentheses/http://oj.leetcode.com/problems/largest-rectangle-in-histo…

利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.com/problems/valid-parentheses/http://oj.leetcode.com/problems/largest-rectangle-in-histo…

Problem Link: http://oj.leetcode.com/problems/word-ladder-ii/ Basically, this problem is same to Word Ladder I, which uses a double-direction BFS. However, the difference is that we need to keep track of all paths during the double-direction BFS in o…

Problem Link: http://oj.leetcode.com/problems/word-ladder/ Two typical techniques are inspected in this problem: Hash Table. One hash set is the words dictionary where we can check if a word is in the dictionary in O(1) time. The other hash set is us…

原链接:http://blog.csdn.net/yangliuy/article/details/44514495 注:此分类仅供大概参考,没有精雕细琢.有不同意见欢迎评论~ 利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.…

https://leetcode.com/problems/word-ladder/ Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWord, such that: Only one letter can be changed at a time Each…

题目来源: https://leetcode.com/problems/word-ladder/ 题意分析: 和上一题目类似,给定一个beginWord和一个endWord,以及一个字典list.这题需要的是要beginWord转化成endWord的最短路径长度. 题目思路: 最短路的思路.将beginWord放进队列,如果队列不为空,那么取出第一个数,将其周围的在字典的字符放进队列,直到周围的存在endword. 代码(python): import Queue class Solution(…

LeetCode 题目总结/分类 利用堆栈: http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/ http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心) http://oj.leetcode.com/problems/valid-parentheses/ http://oj.leetcode.com/problems/large…