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leetcode/problem/different-ways-to-add-parentheses.html

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+<p>Given a string <code>expression</code> of numbers and operators, return <em>all possible results from computing all the different possible ways to group numbers and operators</em>. You may return the answer in <strong>any order</strong>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> expression = &quot;2-1-1&quot;
+<strong>Output:</strong> [0,2]
+<strong>Explanation:</strong>
+((2-1)-1) = 0 
+(2-(1-1)) = 2
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> expression = &quot;2*3-4*5&quot;
+<strong>Output:</strong> [-34,-14,-10,-10,10]
+<strong>Explanation:</strong>
+(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
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= expression.length &lt;= 20</code></li>
+	<li><code>expression</code> consists of digits and the operator <code>&#39;+&#39;</code>, <code>&#39;-&#39;</code>, and <code>&#39;*&#39;</code>.</li>
+	<li>All the integer values in the input expression are in the range <code>[0, 99]</code>.</li>
+</ul>