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描述Given a sorted linked list, delete all duplicates such that each element appear only once.For example,Given 1->1->2, return 1->2.Given 1->1->2->3->3 阅读全文
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题目： Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the 阅读全文
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描述Given n non-negative integers representing an elevation map where the width of each bar is 1, computehow much water it is able to trap after raining 阅读全文
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描述Given a string containing just the characters ’(’ and ’)’, find the length of the longest valid (wellformed) parentheses substring.For ”(()”, the l 阅读全文
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描述Given a string containing just the characters ’(’, ’)’, ’{’, ’}’, ’[’ and ’]’, determine if theinput string is valid.The brackets must close in the 阅读全文
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描述Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return thelength of last word in the string.If the last word 阅读全文
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描述Given an absolute path for a file (Unix-style), simplify it.For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c"Corner Cases:• D 阅读全文
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描述Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.分析Anagram（回文构词法）是指打乱字母顺序从而得到新的单词，比如 阅读全文
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描述The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ...1 is read off as "one 1" or 11.11 is read of 阅读全文
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描述Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.分析从前往后扫描，用一个临时变量记录分段数字。如果当前比前一个大，说明这一段的值应该 阅读全文