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30
votes
30answers
3k views

Stretching Words

Write a program or function that duplicates letters in a word, so that all the duplicated letters arranged from left to right in the word would form the input array. For example: input: chameleon, ...
11
votes
3answers
228 views

Wrap-Around Subsequences

Introduction In this challenge, your task is to find generalized subsequences of strings. The subsequences are not necessarily contiguous, and they can also "wrap around" the string, going past its ...
10
votes
1answer
224 views

Generate a Davenport-Schinzel Sequence

Background A Davenport-Schinzel sequence has two positive integer parameters d and n. We will denote the set of all Davenport-Schinzel sequences for given parameters by DS(d,n). Consider all ...
14
votes
1answer
717 views

Fix unbalanced brackets

Consider the alphabet A ="()[]{}<>". Think of the characters in the alphabet as opening and closing brackets of 4 different types. Let's say that a string over the alphabet A is balanced if it ...
7
votes
9answers
312 views

Group adjacent values

The task is to group adjacent values from collection and output it as a new aggregated collection. Consider we have following input: Sequence Number Value ======== ===== 1 9 2 ...
3
votes
11answers
491 views

The group of sequential positive numbers with the highest sum?

Given the following list of numbers, find the group of sequential positive numbers with the highest sum. Example input: 12 2 35 -1 20 9 76 5 4 -3 4 -5 19 80 32 -1 Example output: 131 The most ...
10
votes
10answers
895 views

Find largest sum of subsequence

Given a sequence of integers find the largest sum of a subsequence (integers on consecutive positions) of the sequence. The subsequence can be empty (in which case the sum is 0). Input is read from ...
11
votes
6answers
2k views

Shortest, lexicographically smallest generating string

A string x generates a string y if y is a substring of an infinite repeat of x. For example abc generates bcabcab. Write a program to find the shortest, lexicographically smallest string that will ...
3
votes
3answers
377 views

Finding “sub-palindromes” 2: subsequences.

The same task as Finding "sub-palindromes" but instead of finding substrings you must find subsequences that are not substrings. eg1: input: "12131331" output: "11", "33", "111", "121", "131", ...