logo CodeStepByStep logo

diceSum

Language/Type: C++ backtracking recursion
Author: Marty Stepp (on 2016/06/16)

Write a recursive function named diceSum that accepts two parameters: an integer representing a number of 6-sided dice to roll, and a desired sum, and output all possible combinations of values that could appear on the dice that would add up to exactly the given sum. For example, the call of diceSum(3, 7); should print all combinations of rolls of 3 dice that add up to 7:

{1, 1, 5}
{1, 2, 4}
{1, 3, 3}
{1, 4, 2}
{1, 5, 1}
{2, 1, 4}
{2, 2, 3}
{2, 3, 2}
{2, 4, 1}
{3, 1, 3}
{3, 2, 2}
{3, 3, 1}
{4, 1, 2}
{4, 2, 1}
{5, 1, 1}

If the number of digits passed is 0 or negative, or if the given number of dice cannot add up to exactly the given sum, print no output. Your function must use recursion, but you can use a single for loop if necessary.

Type your C++ solution code here:


This is a function problem. Write a C++ function as described. Do not write a complete program; just the function(s) above.

You must log in before you can solve this problem.


Log In

Need help?

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.

© Marty Stepp, all rights reserved.