Interview

Calculate the Total Amount of Points using Java

The challenge Our football team finished the championship. The result of each match look like “x:y”.

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FizzBuzz in Java

The challenge Write a program that outputs the string representation of numbers from 1 to n.

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Get the Next Small Integer in Python

The challenge Write a function: def solution(A) that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does not occur in A.

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Find Numbers with Even Number of Digits using Java

The challenge Given an array nums of integers, return how many of them contain an even number of digits.

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How to use a Java HashSet by example

What is a HashSet A HashSet is an unordered collection containing unique elements.

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Get The Shortest Path in Binary Matrix using Python

The challenge In an N by N square grid, each cell is either empty (0) or blocked (1).

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Palindrome Partitioning in Python

The problem Given a string s, partition s such that every substring of the partition is a palindrome.

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Best Time to Buy and Sell Stock with Python

The problem Say you have an array prices for which the ith element is the price of a given stock on day i.

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Find the Minimum Absolute Difference in BST using Java

The question Given a binary search tree with non-negative values, find the minimum absolute difference between values of any two nodes.

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Find Maximum Subarrays using Java

The problem Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.

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Finding Number Complements using Java

The problem Given a positive integer num, output its complement number.

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Self Dividing Numbers using Python

Introduction A self-dividing number is a number that is divisible by every digit it contains.

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Remove the Outermost Parentheses using Python

The Question A valid parentheses string is either empty (""), "(" + A + ")", or A + B, where A and B are valid parentheses strings, and + represents string concatenation.

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Get the Maximum Length of a Concatenated String with Unique Characters in Python

The problem Given an array of strings arr. String s is a concatenation of a sub-sequence of arr which have unique characters.

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How to get the Range Sum of Binary Search Tree using Java

Given the root node of a binary search tree, return the sum of values of all nodes with value between L and R (inclusive).

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How to duplicate zeros in place using Python

Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right.

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How to Reorder Data in Log Files using Python

Let’s say that you have an array or a list, or logs.

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Find positions of largest groups of characters in a String with Python

The question Take a string S of lowercase letters. These letters form consecutive groupings of like characters.

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How to find the longest Palindrome in a String using Python

This occasionally comes up during coding interviews and is actually quite a decent way to test someone’s aptitude of moving back and forth on a string to determine if and where palindromes exist.

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How to get the Maximum Depth of a Binary Tree in Python

Let’s say that you have a binary tree and we needed to know it’s maximum depth.

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What is Fizz Buzz?

Fizz buzz is a common programming interview question. The problem statement usually reads something like this:

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How to write a Quicksort Algorithm in Python

While there are libraries available for all programming languages that offer abilities to sort list, arrays and collections, it is important to know how this is achieved.

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How to Reverse a String or List using Python

Python comes with the power of slicing. Let’s try it with a String:

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How to Reverse a Binary Tree in Python

Reversing a Binary Tree is a common programming interview question.

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