摘要：
题目的意思就是将十进制转换成格雷码首先将二进制转换成格雷码根据此图可以看出二进制的第i和第i+1位异或为格雷码的第i+1位，对于给定的十进制数x，其(x>>1)相当于二进制向右移动一位将 x^(x>>1)刚好能按照上述方式完成异或，故结果为x的格雷码class Solution {public: ... 阅读全文
摘要：
Givennnon-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.Fo... 阅读全文
摘要：
Given a stringSand a stringT, count the number of distinct subsequences ofTinS.A subsequence of a string is a new string which is formed from the orig... 阅读全文
摘要：
Given a linked list, reverse the nodes of a linked listkat a time and return its modified list.If the number of nodes is not a multiple ofkthen left-o... 阅读全文
摘要：
Validate if a given string is numeric.Some examples:"0"=>true" 0.1 "=>true"abc"=>false"1 a"=>false"2e10"=>trueNote:It is intended for the problem stat... 阅读全文
摘要：
Given an unsorted integer array, find the first missing positive integer.For example,Given[1,2,0]return3,and[3,4,-1,1]return2.Your algorithm should ru... 阅读全文
摘要：
Write a function to find the longest common prefix string amongst an array of strings.class Solution {public: string longestCommonPrefix(vector &st... 阅读全文
摘要：
Given a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's runtime complexity must be in the ord... 阅读全文