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Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. T...

ifnum&(num-1)!=0{ fornum&(num-1)!=0{ num&=(num-1) } num=num<<1 }

Determine whether an integer is a palindrome. An integerisapalindrome when itreads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanat...

Implement atoi whichconverts a string to an integer. The function first discards as many whitespace characters as necessary until the first non-whitespace character is found. Then, starting from thi...

Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 code: classSolution{ pub...

第一题： 1252. Cells with Odd Values in a Matrix Givennandmwhich are the dimensions of a matrix initialized by zeros and given an array indiceswhere indices[i] = [ri, ci]. For each pair of [ri, ci]...

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) And then read line by lin...

第一次参加周赛就单双周一起报了。刷的题还不多，因此每场只记录2-3道自己掌握的(比赛时提交通过或完了通不过,事后看一眼就明白怎么回事的)。Cuz my current goal is to get completely control of questions which are easy or medium-hard to solve(The label "hard" marked by Lee...

Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. Exampl...

There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). You may assume nums1 and n...

After gettingthrough of some video lessons about such Binary Tree, Binary Search Tree, I get comprehend of this kind of algorithm method and would like to do a brief implementation. Following is my C...

Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 2: In...

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return i...

1. Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not u...