北叶青藤

2016年7月17日

摘要： Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another e 阅读全文

posted @ 2016-07-17 20:10 北叶青藤阅读(174) 评论(0) 推荐(0) 编辑

71. Simplify Path

摘要： Given an absolute path for a file (Unix-style), simplify it. Have you met this question in a real interview? Yes Example "/home/", => "/home" "/a/./b/ 阅读全文

posted @ 2016-07-17 01:02 北叶青藤阅读(216) 评论(0) 推荐(0) 编辑

2016年7月16日

Integer to Roman & Roman to Integer

摘要： Integer to Roman Given an integer, convert it to a roman numeral. The number is guaranteed to be within the range from 1 to 3999. Integer to Roman Giv 阅读全文

posted @ 2016-07-16 23:04 北叶青藤阅读(224) 评论(0) 推荐(0) 编辑

Distinct Subsequences

摘要： Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed from t 阅读全文

posted @ 2016-07-16 11:39 北叶青藤阅读(184) 评论(0) 推荐(0) 编辑

72. Edit Distance

摘要： Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have 阅读全文

posted @ 2016-07-16 11:21 北叶青藤阅读(193) 评论(0) 推荐(0) 编辑

278. First Bad Version

摘要： The code base version is an integer start from 1 to n. One day, someone committed a bad version in the code case, so it caused this version and the fo 阅读全文

posted @ 2016-07-16 05:12 北叶青藤阅读(177) 评论(0) 推荐(0) 编辑

76. Minimum Window Substring

摘要： Given a string source and a string target, find the minimum window in source which will contain all the characters in target. Notice If there is no su 阅读全文

posted @ 2016-07-16 05:04 北叶青藤阅读(376) 评论(0) 推荐(0) 编辑

Print Numbers by Recursion

摘要： Print numbers from 1 to the largest number with N digits by recursion. Notice It's pretty easy to do recursion like: recursion(i) { if i > largest num 阅读全文

posted @ 2016-07-16 01:37 北叶青藤阅读(226) 评论(0) 推荐(0) 编辑

Anagrams

摘要： Given an array of strings, return all groups of strings that are anagrams. Notice All inputs will be in lower-case Given an array of strings, return a 阅读全文

posted @ 2016-07-16 00:22 北叶青藤阅读(210) 评论(0) 推荐(0) 编辑

Add Two Numbers I & II

摘要： Add Two Numbers I You have two numbers represented by a linked list, where each node contains a single digit. The digits are stored in reverse order, 阅读全文

posted @ 2016-07-16 00:11 北叶青藤阅读(223) 评论(0) 推荐(0) 编辑

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