Evaluate Reverse Polish Notation
Evaluate the value of an arithmetic expression in Reverse Polish Notation Valid operators: +, -, *, / Division truncates toward zero Example: ["2","1","+","3","*"] => 9 ((2+1)*3)
Evaluate Reverse Polish Notation rewards disciplined state tracking more than raw coding speed. Interviewers love it because it reveals your stack invariants and your edge-case discipline. The classic mistake is not being clear about what your stack represents at each step.
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