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# 1. 给表达式加括号
<!-- GFM-TOC -->
* [1. 给表达式加括号](#1-给表达式加括号)
<!-- GFM-TOC -->
[241. Different Ways to Add Parentheses (Medium)](https://leetcode.com/problems/different-ways-to-add-parentheses/description/)
# 1. 给表达式加括号
[241. Different Ways to Add Parentheses (Medium)](https://leetcode.com/problems/different-ways-to-add-parentheses/description/)
```html
Input: "2-1-1".
Input: "2-1-1".
((2-1)-1) = 0
(2-(1-1)) = 2
((2-1)-1) = 0
(2-(1-1)) = 2
Output : [0, 2]
Output : [0, 2]
```
```java
public List<Integer> diffWaysToCompute(String input) {
    List<Integer> ways = new ArrayList<>();
    for (int i = 0; i < input.length(); i++) {
        char c = input.charAt(i);
        if (c == '+' || c == '-' || c == '*') {
            List<Integer> left = diffWaysToCompute(input.substring(0, i));
            List<Integer> right = diffWaysToCompute(input.substring(i + 1));
            for (int l : left) {
                for (int r : right) {
                    switch (c) {
                        case '+':
                            ways.add(l + r);
                            break;
                        case '-':
                            ways.add(l - r);
                            break;
                        case '*':
                            ways.add(l * r);
                            break;
                    }
                }
            }
        }
    }
    if (ways.size() == 0) {
        ways.add(Integer.valueOf(input));
    }
    return ways;
public List<Integer> diffWaysToCompute(String input) {
List<Integer> ways = new ArrayList<>();
for (int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if (c == '+' || c == '-' || c == '*') {
List<Integer> left = diffWaysToCompute(input.substring(0, i));
List<Integer> right = diffWaysToCompute(input.substring(i + 1));
for (int l : left) {
for (int r : right) {
switch (c) {
case '+':
ways.add(l + r);
break;
case '-':
ways.add(l - r);
break;
case '*':
ways.add(l * r);
break;
}
}
}
}
}
if (ways.size() == 0) {
ways.add(Integer.valueOf(input));
}
return ways;
}
```
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