Combinatorics Problems

Moriarty is bored again. When he gets bored, the only thing he w...

• By Sherlock221b
• Counting, NumberTheory
• Moderate
• 15/32
• uDebug

In a popular computer game, Game of Palindromes also known as GO...

• By ghazanfar
• Counting, DP, String
• Moderate
• 15/25

Ever since that wicked thief took away some of her murgis (hens,...

• By Mesbah
• Combinatorics, DP
• Moderate
• 160/245
• uDebug

Let P = C(N,0) - C(N,1) + C(N,2) - C(N,3) + … + C(N,N); where C(...

• By Alim14
• Combinatorics, Counting
• Easy
• 36/42
• uDebug

You are at the top left corner[position (1,1)] of a **R X C ** g...

• By Kryptonyte
• Combinatorics, Counting
• Moderate
• 4/7
• uDebug

Milo has a string S of length L. Tutu picks a random prefix and ...

• Combinatorics, Counting
• Easy
• 4/9
• uDebug

One of Sofdor Ali’s greatest accomplishment was his Biriyani res...

• By TarifEzaz
• Constructive, Counting
• Easy
• 22/59
• uDebug

Sofdor Ali is the craziest and clumsiest scientist in Bangladesh...

• By jackal_1586
• Counting, MatrixExponentiation
• Moderate
• 1/11
• uDebug

Rosi Vidmun is a greedy landlord who likes to grab as much land ...

• By Ariful_Efath
• Counting, NumberTheory
• Moderate
• 21/27
• uDebug

Mr. J wants to learn about combinatorics. He started reading a b...

• By ridowan007
• Combinatorics, Counting, DP
• Easy
• 70/92
• uDebug

There are n people busy with arranging the upcoming Inter Depart...

• By Bhadra
• Combinatorics, Counting
• Moderate
• 4/6
• uDebug

Mr. Ant has 3 boxes and the infinite number of marbles. Now he w...

• By Alim14
• Combinatorics, Counting
• Moderate
• 1/4
• uDebug

In the strange neighborhood of Nocu, a lot of people lives prett...

• By TarifEzaz
• Combinatorics, Counting
• Moderate
• 9/16
• uDebug

Meera bought candies from the store. She is now going to distrib...

• By forthright48
• Combinatorics, Counting, NumberTheory
• Moderate
• 8/38
• uDebug

As some of you already know, Nocu City has a history of having b...

• By TarifEzaz
• Combinatorics, Counting
• Easy
• 17/29
• uDebug

You will be given a set of sequences. Each sequence is a list of...

• By ridowan007
• Combinatorics, Counting, DataStructure
• Moderate
• 40/58
• uDebug

The world is terrified by Pandas! After a miraculous chemical ex...

• By mehdi_
• Combinatorics, Counting, NumberTheory
• Moderate
• 11/16
• uDebug

East West University Computer Programming Club (EWUCoPC) is arra...

• Combinatorics
• Moderate
• 21/88
• uDebug

The problem statement is so small. Give you four integers r, a, ...

• By hasan169
• Combinatorics
• Moderate
• 29/113
• uDebug

“There was a break-in of Gringotts Wizarding Bank on 1 May, 1998...

• By Sherlock221b
• Bitmask, Combinatorics, Counting, DP
• Moderate
• 7/15
• uDebug

Imam has been participating in online programming contests for y...

• By TarifEzaz
• Combinatorics, Counting
• Easy
• 153/191
• uDebug

Alice likes playing with Palindromes (strings that read the same...

• By Sherlock221b
• Combinatorics, Counting
• Easy
• 3/6
• uDebug

Little Oishee loves to watch TV. But her mother, who is a math t...

• By IamHot
• Combinatorics, Counting
• Moderate
• 37/50
• uDebug

The planet earth has become peaceful again because all the cats ...

• By midnightbird
• Counting, MatrixExponentiation
• Moderate
• 27/37
• uDebug

Many many years ago there was a small country . And all the peop...

• By IamHot
• Counting, TwoPointer
• Moderate
• 16/21
• uDebug

The winter is about to come. Mag the Mighty Kaidul is waiting fo...

• By SakibulMowla
• Counting, MatrixExponentiation
• Easy
• 24/25
• uDebug

Mr. Meme has recently moved to a foreign country named “Glorylan...

• Combinatorics
• Moderate
• 65/89