Can you solve this real interview question? Valid Palindrome - A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters…

Can you solve this real interview question? Move Zeroes - Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.

Note that you must do this in-place without making a copy of the array.

 …

Can you solve this real interview question? Best Time to Buy and Sell Stock - You are given an array prices where prices[i] is the price of a given stock on the ith day.

You want to maximize your profit by choosing a single day to buy one stock and choosing…

Can you solve this real interview question? Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without duplicate characters.

 

Example 1:


Input: s = "abcabcbb"
Output: 3
Explanation: The answer…

Can you solve this real interview question? Permutation in String - Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise.

In other words, return true if one of s1's permutations is the substring of s2.

 

Example…

Can you solve this real interview question? Valid Parentheses - Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

An input string is valid if:

1. Open brackets must be closed by the…

Can you solve this real interview question? Baseball Game - You are keeping the scores for a baseball game with strange rules. At the beginning of the game, you start with an empty record.

You are given a list of strings operations, where operations[i] is…

Can you solve this real interview question? Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

Implement the MinStack class:

* MinStack() initializes the stack object.
* void push(int val) pushes…

Can you solve this real interview question? Evaluate Reverse Polish Notation - You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation [http://en.wikipedia.org/wiki/Reverse_Polish_notation].

Evaluate…