# Problems

1 – 50 of 5,046
 Problem Title Likes Solvers Difficulty

#### Problem 40912. Rotate counterclockwise a matrix 90 deg with left-bottom element

Created by: Derik Zhou

Tags rotate

2

152

#### Problem 1752. Get me! v4 (Cody hacking challenge)

Created by: Frequency Domain

Tags hack, get me!

2

17

#### Problem 1763. Primes for Large N: 2^30, System Memory Limit

Created by: Richard Zapor

1

20

#### Problem 1866. Usage of mkdir and copyfile

Created by: Richard Zapor

Tags mkdir, copyfile, pwd

1

19

#### Problem 1875. GJam: 2013 China Event: Cannon Angle

Created by: Richard Zapor

Tags physics, gjam, roots

2

20

Created by: Richard Zapor

Tags urlwrite, unzip

1

13

Created by: Ted

2

4

#### Problem 2043. Six Steps to PCA - Step 1: Centre and Standardize

Created by: Neil Caithness

3

17

#### Problem 2083. Independent direction vectors of a plane

Created by: Marcel

0

15

#### Problem 2166. Concatenate a successive power matrix in a column matrix

Created by: Florian

1

59

#### Problem 221. Boolean algebra

Created by: Tomasz

3

8

#### Problem 225. Subdivide the Segment

Created by: Roger Stafford

2

9

#### Problem 1170. Count the Number of Undirected Cycles in a Graph

Created by: Joseph Kirk

9

16

#### Problem 1307. RPN Calculator for simple arithmetic expressions

Created by: Muthu Annamalai

0

8

#### Problem 1339. Travelling Salesman Problem (TSP)

Created by: Alex P.

1

28

#### Problem 2390. Fair Scoring for Cody

Created by: Nicholas Howe

Tags cody, mtree, scoring

1

7

#### Problem 255. Spiraling out of control....

Created by: Matt Fig

Tags math, spiral

1

10

Created by: goc3

1

50

Created by: goc3

4

104

#### Problem 2901. How to get the additive inverse of a uint8.

Created by: Gregory

Tags uint8

0

89

#### Problem 2907. Collaborative Fun : Nomination

Created by: rifat

3

9

#### Problem 2954. Best Problem Elections

Created by: Jan Orwat

6

45

#### Problem 3006. Test Driven Solution - Probability Problem 2

Created by: Jonathan

1

12

#### Problem 3065. Cycling — Critical Power

Created by: goc3

Tags data, power, cycling

1

37

#### Problem 3082. Scrabble Scores - 10

Created by: goc3

Tags game, board, word

1

22

#### Problem 42617. List of built-in demo images

Created by: Matthew Eicholtz

Tags images

2

10

#### Problem 42778. GJam March 2016 IOW: Polynesiaglot Medium

Created by: Richard Zapor

2

7

#### Problem 43025. Check if a directory is on the current MATLAB search path

Created by: Matthew Eicholtz

0

13

#### Problem 44708. Sherlock Holmes: The Spy Problem

Created by: J. S. Kowontan

0

11

#### Problem 44715. 007: Chinese Barrack Invasion

Created by: J. S. Kowontan

1

15

Created by: JD

2

26

#### Problem 46627. Output the Montgomery Form of the Input Matrix

Created by: David Hill

Tags montgomery

2

17

#### Problem 44074. GJam 2017 Kickstart: Parentheses (Small)

Created by: Richard Zapor

1

16

#### Problem 44075. GJam 2017 Kickstart: Parentheses (Large)

Created by: Richard Zapor

2

15

#### Problem 44894. Orientation of a 3D coordinate frame

Created by: Peter Corke

2

8

#### Problem 45196. Determine whether a given point is inside or outside a polygon

Created by: William

4

27

#### Problem 952. Unique: Enhanced Performance - Avoiding Memory Crash

Created by: Richard Zapor

0

11

#### Problem 965. False position (linear interpolation) method of finding a root.

Created by: Robert Canfield

1

18

#### Problem 973. Partial pivoting for Gauss Elimination

Created by: Robert Canfield

2

9

#### Problem 974. Forward Elimination for Gauss Elimination

Created by: Robert Canfield

1

24

#### Problem 978. Backward Substitution

Created by: Ed Hall

2

32

#### Problem 52839. Easy Sequences 33: Web Trapped Ant

Created by: Ramon Villamangca

2

10

#### Problem 52854. Poly2mask, drawpolygon or patch

Created by: warnerchang

Tags polygon

0

11

#### Problem 54204. Find Current in R circuit.

Created by: Suraj Kumar

1

41

#### Problem 54545. String Logic 8

Created by: Athi

Tags logic, string

0

40

#### Problem 54555. String Logic 10

Created by: Athi

Tags logic, string

0

34

#### Problem 54565. String Logic 12

Created by: Athi

Tags logic, string

0

37

#### Problem 54570. String Logic 13

Created by: Athi

Tags logic, string

0

33

#### Problem 54595. String Logic 18

Created by: Athi

Tags logic, string

0

39

#### Problem 55170. Find all prime factors of the input

Created by: Pisces

Tags primes

0

44

1 – 50 of 5,046