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Checking if(expression.length() == 0) return false; on line 3 is actually incorrect for this problem, but there is no test case for it. By the definition of the problem, empty string should be valid.
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Stacks: Balanced Brackets
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Checking
if(expression.length() == 0) return false;
on line 3 is actually incorrect for this problem, but there is no test case for it. By the definition of the problem, empty string should be valid.