Determine whether a number is unprimeable
The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprim...
Remove all the words that end with "ain"
Given the string s1, return the string s2 with the target characters removed.
For example, given
s1 = 'the main event'
your ...
9ヶ月 前
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Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...
9ヶ月 前
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Quote Doubler
Given a string s1, find all occurrences of the single quote character and replace them with two occurrences of the single quote ...
Which values occur exactly three times?
Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if
x = [1 2...
9ヶ月 前
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Reverse Run-Length Encoder
Given a "counting sequence" vector x, construct the original sequence y.
A counting sequence is formed by "counting" the entrie...
9ヶ月 前
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Find the alphabetic word product
If the input string s is a word like 'hello', then the output word product p is a number based on the correspondence a=1, b=2, ....
9ヶ月 前
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Subset Sum
Given a vector v of integers and an integer n, return the the indices of v (as a row vector in ascending order) that sum to n. I...
9ヶ月 前
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Trimming Spaces
Given a string, remove all leading and trailing spaces (where space is defined as ASCII 32).
Input a = ' singular value deco...
9ヶ月 前
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Make a Palindrome Number
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a revers...
9ヶ月 前
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Which doors are open?
There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...
9ヶ月 前
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Extract leading non-zero digit
<http://en.wikipedia.org/wiki/Benford%27s_law Benford's Law> states that the distribution of leading digits is not random. This...
9ヶ月 前
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Making change
Given an amount of currency, return a vector of this form:
[100 50 20 10 5 2 1 0.5 0.25 0.1 0.05 0.01]
Example:
Input a = ...