Combinatorics Problems

One Day Mr. Professor was taking His schedule class on Discrete Mathematics. In this lecture, He was...

• By RasedulRussell
• Combinatorics
• Moderate
• 19/32 Solutions
• 106 Submissions

Fear no more, this is a problem of geometry! When Moyna was little, he had a math teacher named Shuk...

• By TarifEzaz
• BruteForce, Combinatorics, Geometry
• Moderate
• 321/405 Solutions
• 913 Submissions
• uDebug

A permutation of N integers from 1 to N is an array where each number has appeared exactly once in t...

• By TarifEzaz
• Combinatorics
• Moderate
• 2/6 Solutions
• 20 Submissions

The problem statement is so small. Give you four integers r, a, b, d. Find the summation of all numb...

• By hasan169
• Combinatorics
• Moderate
• 32/129 Solutions
• 617 Submissions
• uDebug

You are given an acyclic, bidirectional graph with N nodes and M edges. The nodes are numbered from ...

• By RamprosadG
• Combinatorics, Graph, Tree
• Moderate
• 20/25 Solutions
• 75 Submissions

Ever since that wicked thief took away some of her murgis (hens, that is), Meena was ever anxious th...

• By Mesbah
• Combinatorics, DP
• Moderate
• 174/262 Solutions
• 612 Submissions
• uDebug

Everyone know about Mina & Raju. They are siblings as well as good friend. The friend-circle of ...

• By emrul_mu
• Combinatorics, DP
• Moderate
• 20/31 Solutions
• 121 Submissions

Mr. Meme has recently moved to a foreign country named “Gloryland” for study purpose. There, he has ...

• Combinatorics
• Moderate
• 72/96 Solutions
• 212 Submissions

Mr. J wants to learn about combinatorics. He started reading a book on combinatorics and came across...

• By ridowan007
• Combinatorics, Counting, DP
• Moderate
• 84/109 Solutions
• 186 Submissions
• uDebug

There is an N*N grid where (r,c) denotes a cell number where r means row number, c means column numb...

• By liar_rakib
• Combinatorics
• Moderate
• 31/87 Solutions
• 369 Submissions

Dr. Bari is working on some chemical formation. He believes that chemicals and shapes that are regul...

• By RasheedAbid
• Combinatorics, Geometry
• Moderate
• 205/230 Solutions
• 400 Submissions

Have you ever cooked something? No? Not a problem! Whenever you try to cook something, you need some...

• By AnikaTahsin
• Combinatorics
• Moderate
• 183/230 Solutions
• 545 Submissions

Imam has been participating in online programming contests for years. His goal is to become a “Maste...

• By TarifEzaz
• Combinatorics, Counting
• Moderate
• 161/199 Solutions
• 574 Submissions
• uDebug

East West University Computer Programming Club (EWUCoPC) is arranging an Intra-University Programmin...

• Combinatorics
• Moderate
• 23/95 Solutions
• 407 Submissions
• uDebug

Welcome to the string factory where strings are generated in a peculiar manner. You are given a stri...

• By Bishal_G
• Counting
• Moderate
• 99/110 Solutions
• 209 Submissions

There are n people busy with arranging the upcoming Inter Department Programming Contest (IDPC) 2016...

• By Bhadra
• Combinatorics, Counting
• Moderate
• 5/7 Solutions
• 22 Submissions
• uDebug

Let P = C(N,0) - C(N,1) + C(N,2) - C(N,3) + … + C(N,N); where C(n,r) is “n choose r”. You are given ...

• By Alim14
• Combinatorics, Counting
• Moderate
• 56/70 Solutions
• 176 Submissions
• uDebug

Mr. Ant has 3 boxes and the infinite number of marbles. Now he wants to know the number of ways he c...

• By Alim14
• Combinatorics, Counting
• Moderate
• 3/11 Solutions
• 13 Submissions
• uDebug

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

• Combinatorics, Counting
• Moderate
• 7/15 Solutions
• 24 Submissions
• uDebug

In the strange neighborhood of Nocu, a lot of people lives pretty happily, or so they think. Like mo...

• By TarifEzaz
• Combinatorics, Counting
• Moderate
• 9/16 Solutions
• 35 Submissions
• uDebug