Problems

1 – 18 of 18

Problem Title Likes Solvers Difficulty

Problem 509. Count photos

Created by: AMITAVA BISWAS

Tags combinatorics, basic matlab

385

Problem 47838. Count the ways pairs of parentheses can be matched correctly

Created by: ChrisR

Tags combinatorics, parentheses, special numbers

Problem 51820. Count unique orderings of vertices of a polygon

Created by: ChrisR

Tags combinatorics, permutations, sequence

Problem 46551. Solve a ballot counting problem

Created by: ChrisR

Tags combinatorics

Problem 44735. Aztec Diamond domino tilings

Created by: HH

Tags combinatorics, tiling

Problem 54020. Circle Division

Created by: HH

Tags combinatorics, division, circle

Problem 54390. That's not my hat!

Created by: Sourabh Warrier

Tags combinatorics, recursion

Problem 1463. Pascal's Matrix

Created by: Yaroslav

Tags math, matlab 101, combinatorics

217

Problem 44066. Number of paths on a 3d grid

Created by: Jihye Sofia Seo

Tags math, combinatorics, programming

Problem 1483. Number of paths on a grid

Created by: G K

Tags math, combinatorics, programming

Problem 52629. Count the ways to draw non-intersecting chords between points on a circle

Created by: ChrisR

Tags combinatorics, geometry, sequence

Problem 44072. Number of paths on a n-dimensional grid

Created by: Jihye Sofia Seo

Tags combinatorics, hypercube, grid

Problem 37. Pascal's Triangle

Created by: Cody Team

Tags math, combinatorics

3655

Problem 604. Next lexicographic - permutation

Created by: Muthu Annamalai

Tags combinatorics, permutations

Problem 56448. nth permutation of 11...100...0

Created by: Scott Stetson

Tags combinatorics, permutations

Problem 44787. What can you get for exactly amount of money(harder)

Created by: li haitao

Tags combinatorics, search, knapsack problem

Problem 52729. Easy Sequences 21: Combinatorial Summations

Created by: Ramon Villamangca

Tags easy, combinatorics, number theory

Problem 45303. Combinatorics - 01

Created by: Asif Newaz

Tags combinatorics, logic

1 – 18 of 18

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Problem Groups

Difficulty Rating

Problem Groups

Problems

Problem 509. Count photos

Problem 47838. Count the ways pairs of parentheses can be matched correctly

Problem 51820. Count unique orderings of vertices of a polygon

Problem 46551. Solve a ballot counting problem

Problem 44735. Aztec Diamond domino tilings

Problem 54020. Circle Division

Problem 54390. That's not my hat!

Problem 1463. Pascal's Matrix

Problem 44066. Number of paths on a 3d grid

Problem 1483. Number of paths on a grid

Problem 52629. Count the ways to draw non-intersecting chords between points on a circle

Problem 44072. Number of paths on a n-dimensional grid

Problem 37. Pascal's Triangle

Problem 604. Next lexicographic - permutation

Problem 56448. nth permutation of 11...100...0

Problem 44787. What can you get for exactly amount of money(harder)

Problem 52729. Easy Sequences 21: Combinatorial Summations

Problem 45303. Combinatorics - 01