* [224] Basic Calculator * * Implement a basic calculator to evaluate a simple expression string. * * The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . * * Example 1: * * * Input: "1 + 1" * Output: 2 * * * Example 2: * * * Input: " 2-1 + 2 " * Output: 3 * * Example 3: * * * Input: "(1+(4+5
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