Exercises

Say that a "clump" in an array is a series of 2 or more adjacent elements of the same value. Return the number of clumps in the given...

Given an array, return an array that contains exactly the same numbers as the original array, but rearranged so that every 4 is...

Given a string, does "xyz" appear in the middle of the string? To define middle, we'll say that the number of chars to the left and right...

Given a string str and an int n, return a string made of the first n characters of the string, followed by the first n - 1 characters of...

Return an array that contains the exact same numbers as the given array, but rearranged so that all the even numbers come before all the...

Given n >= 0, create an array with the pattern {1, 1, 2, 1, 2, 3, ... 1, 2, 3 .. n} (spaces added to show the grouping). Note that...

Given a string of any length, return a new string where the last 2 chars, if present, are swapped, so "coding" yields "codign".

Given a string, return true if "bad" appears starting at index 0 or 1 in the string, such as with "badxxx" or "xbadxx" but not "xxbadxx"....

Return a version of the given string, where for every star (*) in the string the star and the character immediately to its left and the...

Return true if somewhere in the array, there are three increasing adjacent numbers like .... 4, 5, 6, ... or 23, 24, 25.

Given start and end integers, return a new array containing the sequence of integers from start up to but not including end, so start = 5...

Return an array that is "left shifted" by one--so for an input of {6, 2, 5, 3}, the method returns {2, 5, 3, 6}. You may modify and...

Given a non-empty array of ints, return a new array containing the elements from the original array that come after the last 4 in the...

We'll say that an element in an array is "alone" if there are values before and after it, and those values are different from it. Return...

Return an array that contains the exact same numbers as the given array, but rearranged so that all the zeros are grouped at the start of...

Given two arrays of ints sorted in increasing order, called outer and inner, return true if all of the numbers in inner also appear in ...

Given n >= 0, create an array of length n * n with the following pattern, shown here for n = 3 : {0, 0, 1, 0, 2, 1, 3, 2, 1} (spaces...

Given an out string of length 4, such as "<<>>", and a word, return a new string where the word is in the middle of the out...

Given a string, return a new string made of 3 copies of the last 2 chars of the original string. The string's length will be at least 2.

Given a string, return the string made of its first two chars, so the string "Hello" yields "He". If the string is shorter than length 2,...

Return true if the string "cat" and "dog" appear the same number of times in the given string.

Return true if the given string contains a "bob" string, but where the middle 'o' character can be any character.

Given two strings, word and a separator sep, return a big string made of count occurrences of the word, separated by the separator...

Given a string, count the number of words ending in 'y' or 'z'--so the 'y' in "heavy" and the 'z' in "fez" count, but not the 'y' in...

We have bunnies standing in a line, numbered 1, 2, ... The odd bunnies (1, 3, 5, ...) have the normal 2 ears. The even bunnies (2, 4,...