Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward
LeetCode - Evaluate Reverse Polish Notation Evaluate Reverse Polish Notation 2014.2.25 23:42 Evaluate the value of an arithmetic expression inReverse Polish Notation. Valid operators are+,-,*,/. Each operand may be an integer or another expression. Some examples: ["2","1","+","3","*"]...
Evaluate the value of an arithmetic expression inReverse Polish Notation. Valid operators are+,-,*,/. Each operand may be an integer or another expression. Some examples: ["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9 ["4", "13", "5", "/", "+"] -> (4 + ...
SELECTa.left_operand,a.operator,a.right_operand,CASEWHENb.value>c.valueANDa.operator='>'THEN'true'WHENb.value=c.valueANDa.operator='='THEN'true'WHENb.value<c.valueANDa.operator='<'THEN'true'ELSE'false'ENDASvalueFROMExpressionsASaLEFTJOINVariablesASbONa.left_operand=b.nameLEFTJOINVariablesAScONa...
Evaluate the value of an arithmetic expression inReverse Polish Notation. Valid operators are+,-,*,/. Each operand may be an integer or another expression. Some examples: ["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9 ...