Medium

Quiz

#241 Different Ways to Add Parentheses

APPROACH

Given a string expression of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. You may return the answer in any order.

The test cases are generated such that the output values fit in a 32-bit integer and the number of different results does not exceed 10⁴.

Example 1:

Input: expression = "2-1-1"

Output: [0,2]

Explanation:

((2-1)-1) = 0

(2-(1-1)) = 2

Example 2:

Input: expression = "2*3-4*5"

Output: [-34,-14,-10,-10,10]

Explanation:

(2*(3-(4*5))) = -34

((2*3)-(4*5)) = -14

((2*(3-4))*5) = -10

(2*((3-4)*5)) = -10

(((2*3)-4)*5) = 10

1 of 4

What is the optimal approach for this problem?