## Similar Pair, Graph algorithm problem

A pair of nodes,(a,b) , is a similar pair if both of the following conditions are true: Node a  is...

## Sum vs XOR, Bit manipulation problem

Given an integer, n, find each x such that: 0<=x <=n n+x = n^ x where ^  denotes the bitwise...

## Breaking the Records, Algorithm problem

Maria plays n  games of college basketball in a season. Because she wants to go pro, she tracks her...

## Between Two Sets, Algorithm problem

Consider two sets of positive integers, A= {a0,a1…an-1} andA= {b0,b1…bn-1} . We say that a positive integer, , is between...

## Kangaroo, Algorithm Problem

There are two kangaroos on an x-axis ready to jump in the positive direction (i.e, toward positive infinity). The...

HackerLand University has the following grading policy: Every student receives a in the inclusive range from to . Any...

## Apple and Orange, Algorithm

Sam’s house has an apple tree and an orange tree that yield an abundance of fruit. In the diagram...

HackerLand University has the following grading policy: Every student receives a in the inclusive range from to . Any...

## Birthday Cake Candles, Algorithm

Colleen is turning years old! She has candles of various heights on her cake, and candle has height ....

## Time Conversion, Algorithm

Given a time in -hour AM/PM format, convert it to military (-hour) time. Note: Midnight is on a -hour...

## Mini-Max Sum, Algorithm

Given five positive integers, find the minimum and maximum values that can be calculated by summing exactly four of...

## Staircase, Algorithm

Consider a staircase of size : # ## ### #### Observe that its base and height are both equal...

## Plus Minus, Algorithm

Given an array of integers, calculate which fraction of its elements are positive, which fraction of its elements are...

## Diagonal Difference, Algorithm

Given a square matrix of size , calculate the absolute difference between the sums of its diagonals. Input Format...

## A Very Big Sum, Algorithm

You are given an array of integers of size . You need to print the sum of the elements...

## Compare the Triplets, Algorithm

Alice and Bob each created one problem for HackerRank. A reviewer rates the two challenges, awarding points on a...

## Simple Array Sum, Algorithm

Given an array of integers, can you find the sum of its elements? Input Format The first line contains...

## Solve Me First, Algorithm

Welcome to HackerRank! The purpose of this challenge is to familiarize you with reading input from stdin (the standard...

## Insertion Sort with PHP – Part 2

In Insertion Sort Part 1, you sorted one element into an array. Using the same approach repeatedly, can you...

## Insertion Sort with PHP – Part 1

Sorting One common task for computers is to sort data. For example, people might want to see all their...