Example 1
Example 2
Example 3
1 <= s.length <= 3 * 105s consists of digits, '+', '-', '(', ')', and ' '.s represents a valid expression.'+' is not used as a unary operation (i.e., "+1" and "+(2 + 3)" is invalid).'-' could be used as a unary operation (i.e., "-1" and "-(2 + 3)" is valid).There will be no two consecutive operators in the input.Every number and running calculation will fit in a signed 32-bit integer.Example 1
Example 2
Example 3
1 <= s.length <= 3 * 105s consists of digits, '+', '-', '(', ')', and ' '.s represents a valid expression.'+' is not used as a unary operation (i.e., "+1" and "+(2 + 3)" is invalid).'-' could be used as a unary operation (i.e., "-1" and "-(2 + 3)" is valid).There will be no two consecutive operators in the input.Every number and running calculation will fit in a signed 32-bit integer.