## 412. Fizz Buzz Python 3 Solution

412. Fizz Buzz Python 3 Solution for LeetCode and HackerRank problems Requirements Input: integer n Output: string array answer (1-indexed) where: answer[i] == “FizzBuzz” when i is divisible by both 3 and 5. answer[i] == “Fizz” when i is divisible by 3. answer[i] == “Buzz” when i is divisible by 5. answer[i] == i for […]

## 155. Min Stack

155. Min Stack Solution programming interview question. Design a stack that can return the minimum element in constant time and also support pus, pop and top methods. Example:Input[“MinStack”,”push: -3″,”push: 0″,”push: -5″,”getMin”,”pop”,”top”,”getMin”] OutputMinStack minStack = new MinStack();minStack.push(-3); // returns nullminStack.push(0); // returns nullminStack.push(-5); // returns nullminStack.getMin(); // return -5minStack.pop(); // returns nullminStack.top(); // return 0minStack.getMin(); // […]

## 20. Valid Parentheses Leetcode Solution

Valid Parentheses Leetcode 20 Solution Return boolean indicating wether the pairs of paranthesis are matching and there are no un-matched paranthesis found. Using a list to implement a stack in Python.Store all the pairs of opening and closing tags in a dictionary. Closing brackets are the key.Go thru the characters of the string and add […]

## 66. Plus One LeetCode Solution in Python

Plus One LeetCode Solution in Python 3. Given a non empty array of decimal digits representing a non-begative integer.Increment the integer, most significant digit is on the left. Each element contains a single digit.No leading zeros except for the number 0. Examples Input: digits = [1,2,3] Output: [1,2,4] Input array represents the int 123 + […]

## Google 844. Backspace String Compare

Google Interview 844. Backspace String Compare Given two strings s and t, return True if they are equal. ‘#’ means backspace. Examples Input: s = “ab#c”, t = “ad#c” Output: true Explanation: Both s and t become “ac”. Input: s = “abb#c”, t = “ade#c” Output: false Explanation: s becomes “abc” and t becomes “adc”. […]

## LeetCode 482 License Key Formatting Solution

LeetCode 482 License Key Formatting Solution in Python 3. LeetCode 482 Solution 32 ms in Python 3 You are given a license key represented by the string s that contains only alphanumeric characters and dashes. You are also given an integer k. Reformat the string s so that each group contains exactly k characters, except […]

## Google Leetcode 929 Unique Email Addresses

Google Interview Questions – Leetcode 929 Unique Email Addresses Fast Solution Level: Easy Analysis Every valid email has a local name and the domain name separated by @ symbol. Dots in the local name are removed when checking for uniqueness. any character after the + sign is ignored. Domain names are left as they are […]

## How to reverse a string in Python 3

To reverse a string in Python the bellow are the best ways so far: Write [::-1] to do slicing in Python starting at first character, until last, step by 1 in reverse (-1). It’s a pretty nice way to impress your imaginary friends. Option 1 Option 2 Whole code demo Write a comment or no, […]

## Find the missing number in an array

Computer science job interview question:Find the missing number in the series.Write a program to calculate the missing number in the series of integers. There are multiple ways to do this bu using the Gauss Sum addition method is a nice trick and it’s faster than any brute-force iteration you might think of.More info https://en.wikipedia.org/wiki/Gauss_sum The […]