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Bob had N isolated nodes. He decided to connect the nodes by creating new edges and make a tree. So ...

BinarySearch Moderate 11/13/38

A perfect binary tree is a binary tree in which all interior nodes have two children and all leaves ...

HeavyLightDecomposition Moderate 4/6/45

Today is Luke's birthday. Mr. Phil Dunphy (Luke's father) has thrown a birthday party for him and de...

Flow, Greedy Moderate 6/29/85

Biswa has started Borhani (kind of a soft drink) business recently and made it the new sexy in no ti...

Moderate 25/43/151

Raze is a new agent in Valorant Inc. Currently, she is training on how to use Boom Bot. The training...

Moderate 6/8/13

It's Christmas time! It's the time when Santa brings gift for the children. This year Santa has $K$ ...

InclusionExclusion Hard 10/10/33

You are given a tree containing N vertices. The vertices are numbered from 1 to N. A tree with N ver...

DataStructure, HeavyLightDecomposition Moderate 6/8/48

There is a rectangular lake with N rows and M columns and you are standing on a stone in the top lef...

Moderate 23/27/72

Let's define a function $f$: $f(x) = ax + b$ We know, $f^2(x) = f(f(x))$ and $f^3(x) = f(f(f(x)))$. ...

Moderate 14/32/112

Alex is participating in a game show. Mr. Phil is the host of the game. Alex is provided with an arr...

Combinatorics, NumberTheory, Probability Moderate 2/2/2

Mary is an intellectually gifted 7-year-old girl. On her first day at school, she impressed her math...

11/26/130

Shikamaru is the most brilliant student of his class. He is very good at Mathematics. Mr. Asuma is t...

Hashing, MOSAlgorithm, NumberTheory Very Easy 63/132/706

You are given two connected graphs $G_1$ and $G_2$. Both of the graphs have $N$ vertices and $N$ num...

Hashing, KnuthMorrisPratt Moderate 15/36/117

Sasuke is a 12-year old ninja who is very much interested in learning Ninjutsu (A tactic used by nin...

SegmentTree Moderate 130/214/1k

Shak is a new programmer and he knows nothing about algorithms. He has made a plan and decided to le...

Math, String Moderate 57/85/250

You have got a 6 sided dice. In a single roll, it may show any integers from 1 to 6. You are going t...

Math Very Easy 287/295/370

You have an array of size N which contains positive integers. You can apply the following operation ...

DP Moderate 7/19/42

You are given a pyramid with a polygonal base. Can you calculate the volume and surface area of the ...

Very Hard 29/31/61

Hello , Programmers. There is one thing that I don't like about competitive problem solving, which i...

Math Easy 109/144/416

You are given a tree containing N vertices. The vertices are numbered from 1 to N. A tree with N ver...

DataStructure, LowestCommonAncestor Hard 15/18/89

Euler's totient function counts the number of positive integers up to a given integer N that are rel...

PollardRho, RabinMiller Moderate 9/22/91

It is believed that the hidden island of TreasureLand has many unsolved mysteries and undiscovered t...

Greedy, String Moderate 28/131/381

Today we will learn about a special type of graph called Wheel Graph. In the mathematical discipline...

Math Moderate 111/120/182