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1、题目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 use the sam...

198. House RobberYou are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is t...

516. Longest Palindromic SubsequenceGiven a string s, find the longest palindromic subsequence’s length in s. You may assume that the maximum length of s is 1000.Example 1:Input:"bbbab"Output:4...

5. Longest Palindromic SubstringGiven 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"...

64. Minimum Path SumGiven a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path.Note: You can only move eithe...

866. Prime PalindromeFind the smallest prime palindrome greater than or equal to N.Recall that a number is prime if it’s only divisors are 1 and itself, and it is greater than 1.For example, 2,3,5,...

337. House Robber IIIThe thief has found himself a new place for his thievery again. There is only one entrance to this area, called the “root.” Besides the root, each house has one and only one pare...

213. House Robber IIYou are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in a circle. That mean...

文章目录150.Evaluate Reverse Polish NotationSolution150.Evaluate Reverse Polish NotationMediumEvaluate the value of an arithmetic expression in Reverse Polish Notation.Valid operators are +, -, *, /. ...

1、题目Given a positive integer num, write a function which returns True if num is a perfect square else False.Note: Do not use any built-in library function such as sqrt.Example 1:Input: 16Return...

1、题目Given a pattern and a string str, find if str follows the same pattern.Here follow means a full match, such that there is a bijection between a letter in pattern and a non-empty word in str.Ex...

1、题目Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.Example:Input: 1->2->4, 1->3->4Output: 1-&g...

1、题目Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.An input string is valid if:Open brackets must be closed by the same type of b...

10. Regular Expression MatchingGiven an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'.'.' Matches any single character.'*' Matches zero or m...