In recursive backtracking, if one set of recursive calls does not result in a solution to the problem, what happens?
A) The program returns to a previous decision point and makes a different decision.
B) The program backs up to the previous decision point and throws an exception.
C) The program continues, with unexpected results.
D) The program backs up to the original method call.

Question

Quizplus · Accepted Answer

If one set of recursive calls does not result in a solution to the problem, the program returns to a previous decision point and makes a different decision. This allows the algorithm to explore all possible solutions until it finds the correct one. Backing up to the previous decision point and throwing an exception (B) would be too drastic and would not allow for further exploration. Continuing with unexpected results (C) is not desirable, as it could lead to incorrect or incomplete solutions. Backing up to the original method call (D) would mean giving up on the current path and starting over from scratch, which is inefficient. Therefore, the best choice is A.

In Recursive Backtracking, If One Set of Recursive Calls Does