Leetcode:different Ways to Add parentheses

Source: Internet
Author: User

Different Ways to Add parentheses


Total Accepted: 22360 Total Submissions: 62962 Difficulty: Medium

Given A string of numbers and operators, return all possible results from computing all the different possible ways to Gro Up numbers and operators.

The valid operators + are, - and * .


Example 1

Input: "2-1-1" .

((2-1)-1) = 0 ((1-1)) = 2

Output:[0, 2]


Example 2

Input:"2*3-4*5"

((4*5)) =-34 ((2*3)-(4*5)) = 14 ((3-4)) = 10 (((3-4))) =-10 (((2*3) 4) = 10

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

Credits:
Special thanks to @mithmatt for adding this problem and creating all test cases.

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Java code:

public class Solution {list<integer> Diffwaystocompute (String input) {list<integer> ret = n                EW arraylist<integer> ();                        for (int i=0;i<input.length (); i++) {int c = Input.charat (i);                if (c== ' + ' | | c== '-' | | c== ' * ') {list<integer> leftlist = Diffwaystocompute (input.substring (0,i));                list<integer> rightlist = Diffwaystocompute (input.substring (i+1));                        for (int left:leftlist) {for (int right:rightlist) {int t = 0;                                Switch (c) {case ' + ': t = left + right;                            Break                                Case '-': t = left-right;                            Break                                Case ' * ': t = left * RIGHT;                        Break                    } ret.add (t);            }    }}} if (Ret.size () ==0) {Ret.add (integer.valueof (input));    } return ret; }}


Leetcode:different Ways to Add parentheses

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