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,...

# Exercises

Given a non-negative int `n`

, return the sum of its digits recursively (no loops). Note that mod (`%`

) by 10 yields the rightmost digit (126...

Given a non-negative int `n`

, compute recursively (no loops) the count of the occurrences of 8 as a digit, except that an 8 with another 8...

Given an array of `int`

s, compute recursively the number of times that the value 11 appears in the array (no loops). We'll use the...

Given a string, compute recursively a new string where all the adjacent chars are now separated by a "*". So given "hello", return...

Given a string that contains a single pair of parenthesis, compute recursively a new string containing only the parentheses and their...

Given a string and a non-empty substring `sub`

, compute recursively if at least `n`

copies of `sub`

appear in the string somewhere, possibly...

Given a string `str`

and a non-empty substring `sub`

, compute recursively the largest substring which both starts and ends with `sub`

and...

Given a string, return `true`

if it is a nesting of zero or more pairs of parentheses, like "(())" or "((()))". Suggestion: check the first...

Given a string, compute recursively (no loops) the number of times lowercase "hi" appears in the string.

Count recursively (no loops) the total number of "abc" and "aba" substrings that appear in the given string.

Given a string, compute recursively (no loops) a new string where all the lowercase 'x' chars have been changed to 'y' chars.

Given `base`

and `n`

that are both 1 or more, compute recursively (no loops) the value of `base`

to the `n`

power, so `powerN(3, 2)`

is 9 (3...

We'll say that a "pair" in a string is two instances of the same character separated by another character. So in "AxA", the A's make a...

Given a string, return a recursively "cleaned" string where adjacent chars that are the same have been reduced to a single char. So...

Given an array of `int`

s, compute recursively if the array contains somewhere a value followed immediately by that same value times 10....

Given a string, compute recursively a new string where all the 'x' chars have been removed.

Given an array of `int`

s, compute recursively if the array contains a 6. We'll use the convention of considering only the part of the array...

Given a non-negative int `n`

, return the count of the occurrences of 7 as a digit, so for example 717 yields 2. (no loops). Note that mod (...

Given a string, compute recursively (no loops) a new string where all appearances of "pi" have been replaced by "3.14".

Given a day of the week encoded as 0 = Sun, 1 = Mon, 2 = Tue, ... 6 = Sat, and a boolean indicating if we are on vacation, return a...

The number 6 is a truly great number. Given two `int`

values, `a`

and `b`

, return true if either one is 6. Or if their sum or difference is 6....

When squirrels get together for a party, they like to have cigars. A squirrel party is successful when the number of cigars is between 40...

You and your date are trying to get a table at a restaurant. The parameter `you`

is the stylishness of your clothes, in the range 0..10,...

You have a green lottery ticket, with `int`

s `a`

, `b`

, and `c`

on it. If the numbers are all different from each other, the result is 0. If all...