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

7.Reverse Integer 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 Not...

14.Longest Common Prefix Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string"". Example 1: Input: ["flowe...

9.Palindrome Number 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: -...

13.Roman to Integer Roman numerals are represented by seven different symbols:I,V,X,L,C,DandM. Symbol Value I 1 V 5 X 10 L 50 C ...