# Problems

1 – 30 of 30
 Problem Title Likes Solvers Difficulty

#### Problem 45496. Ordered pairs of integers (I, J).

Created by: Prasad Reddy

1

33

#### Problem 45495. Number of o rderd pairs of integers (I,J) that can be formed.

Created by: Prasad Reddy

1

29

#### Problem 43079. Check if two matrices are permutations of each other

Created by: Mohammad Haghighat

4

50

#### Problem 43073. Check if a matrix is a palindrome in all directions

Created by: Mohammad Haghighat

5

88

#### Problem 51820. Count unique orderings of vertices of a polygon

Created by: ChrisR

1

16

#### Problem 43072. Check if a rotated array was originally sorted

Created by: Mohammad Haghighat

4

66

Created by: 埃博拉酱

1

17

#### Problem 51466. List prime anagrams of a number

Created by: ChrisR

1

17

#### Problem 2394. Permutation

Created by: Kumar Sandeep

0

40

#### Problem 1649. Magic - Faro Shuffle

Created by: Richard Zapor

2

14

#### Problem 46037. Count alternating permutations

Created by: ChrisR

1

8

#### Problem 19. Swap the first and last columns

Created by: Cody Team

92

17132

#### Problem 154. Reverse Boggle

Created by: @bmtran (Bryant Tran)

3

35

#### Problem 55280. Count estrangements

Created by: ChrisR

1

4

#### Problem 51451. Guess the card in Fitch Cheney’s five-card trick

Created by: ChrisR

0

2

#### Problem 51461. Pass the cards in Fitch Cheney's five-card trick

Created by: ChrisR

0

1

Created by: G K

3

31

#### Problem 2324. GJam 2014 Rd 1c: Train Cars

Created by: Richard Zapor

1

8

#### Problem 2325. GJam 2014 Rd 1c: Reordering Train Cars (Large)

Created by: Richard Zapor

1

2

#### Problem 56250. Counting Permutations

Created by: Dyuman Joshi

1

6

#### Problem 892. Solve Rubik's Cube - Up to Two Face Moves

Created by: Richard Zapor

1

5

#### Problem 986. Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration

Created by: Everett Rubel

1

11

#### Problem 1393. A (wrong) place for everything, and everything in its (wrong) place

Created by: James

2

48

#### Problem 1388. Numbered lottery balls into cells

Created by: James

1

36

#### Problem 604. Next lexicographic - permutation

Created by: Muthu Annamalai

2

45

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

Created by: Scott Stetson

1

3

#### Problem 42494. Which permutation is it?

Created by: Jan Orwat

2

30

#### Problem 42495. N-th permutation.

Created by: Jan Orwat

2

31

#### Problem 44502. Anyone for tennis? Your chances of winning a (standard) game

Created by: David Verrelli

1

4

#### Problem 44503. Anyone for tennis? Your chances of winning a tie-break game

Created by: David Verrelli

2

4

1 – 30 of 30