# Problems

1 – 50 of 76
 Problem Title Likes Solvers Difficulty

#### Problem 5. Triangle Numbers

Created by: Cody Team

Tags math, triangle, nice

107

21585

#### Problem 26. Determine if input is odd

Created by: Cody Team

114

21029

#### Problem 6. Select every other element of a vector

Created by: Cody Team

144

25338

#### Problem 17. Find all elements less than 0 or greater than 10 and replace them with NaN

Created by: Cody Team

61

14229

#### Problem 76. De-dupe

Created by: Cody Team

Tags matlab

11

2261

#### Problem 35. Quote Doubler

Created by: Cody Team

9

2246

#### Problem 33. Create times-tables

Created by: Cody Team

Tags matrices

83

12709

#### Problem 41. Cell joiner

Created by: Cody Team

Tags strings, matlab

28

4229

#### Problem 14. Find the numeric mean of the prime numbers in a matrix.

Created by: Cody Team

Tags easy, matrices

42

7701

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

Created by: Cody Team

83

15632

#### Problem 30. Sort a list of complex numbers based on far they are from the origin.

Created by: Cody Team

23

4859

#### Problem 12. Fibonacci sequence

Created by: Cody Team

94

11405

#### Problem 20. Summing digits

Created by: Cody Team

Tags strings, sum

32

6545

#### Problem 32. Most nonzero elements in row

Created by: Cody Team

Tags matrices

37

6448

#### Problem 72. Interpolator

Created by: Cody Team

33

2916

#### Problem 21. Return the 3n+1 sequence for n

Created by: Cody Team

Tags 3n+1, sample

73

7014

#### Problem 9. Who Has the Most Change?

Created by: Cody Team

70

7708

#### Problem 10. Determine whether a vector is monotonically increasing

Created by: Cody Team

106

15365

#### Problem 25. Remove any row in which a NaN appears

Created by: Cody Team

70

7606

#### Problem 22. Remove the vowels

Created by: Cody Team

Tags regexp, siam

23

5322

#### Problem 4. Make a checkerboard matrix

Created by: Cody Team

184

14032

#### Problem 62. Elapsed Time

Created by: Cody Team

Tags time

14

2216

#### Problem 66. Find the two-word state names

Created by: Cody Team

Tags regexp, states

5

962

#### Problem 39. Which values occur exactly three times?

Created by: Cody Team

Tags search

20

4371

#### Problem 40. Reverse Run-Length Encoder

Created by: Cody Team

Tags encoding

15

1980

#### Problem 73. Replace NaNs with the number that appears to its left in the row.

Created by: Cody Team

Tags matlab

16

2420

#### Problem 44. Trimming Spaces

Created by: Cody Team

9

1809

#### Problem 50. QWERTY coordinates

Created by: Cody Team

Tags indexing

18

1842

#### Problem 42. Find the alphabetic word product

Created by: Cody Team

Tags matlab

10

2711

#### Problem 28. Counting Money

Created by: Cody Team

Tags regexp, strings

14

2887

#### Problem 57. Summing Digits within Text

Created by: Cody Team

Tags strings

10

1838

#### Problem 87. Indexed Probability Table

Created by: Cody Team

Tags matlab

7

1740

#### Problem 94. Target sorting

Created by: Cody Team

Tags sorting, matlab

26

3821

#### Problem 46. Which doors are open?

Created by: Cody Team

24

2607

#### Problem 49. Sums with Excluded Digits

Created by: Cody Team

Tags strings

12

1613

#### Problem 60. The Goldbach Conjecture

Created by: Cody Team

Tags primes

55

4591

#### Problem 77. Clean the List of Names

Created by: Cody Team

Tags strings

3

1186

#### Problem 23. Finding Perfect Squares

Created by: Cody Team

Tags sets

122

13400

#### Problem 13. Remove all the consonants

Created by: Cody Team

Tags regexp, basics

23

3529

#### Problem 37. Pascal's Triangle

Created by: Cody Team

21

3461

#### Problem 27. Pangrams!

Created by: Cody Team

Tags strings

32

3031

#### Problem 16. Return the largest number that is adjacent to a zero

Created by: Cody Team

Tags vectors

25

4392

#### Problem 53. Duplicates

Created by: Cody Team

5

1634

#### Problem 74. Balanced number

Created by: Cody Team

Tags matlab

19

2337

#### Problem 47. Extract leading non-zero digit

Created by: Cody Team

5

1563

#### Problem 80. Test for balanced parentheses

Created by: Cody Team

Tags regexp, parens

9

1013

#### Problem 15. Find the longest sequence of 1's in a binary sequence.

Created by: Cody Team

67

4572

#### Problem 51. Find the two most distant points

Created by: Cody Team

Tags distance

8

2110

#### Problem 64. The Goldbach Conjecture, Part 2

Created by: Cody Team

Tags primes

16

1738

#### Problem 48. Making change

Created by: Cody Team

Tags money, subs

15

2697

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