Stack pattern
Evaluate Reverse Polish Notation
Evaluate an arithmetic expression in Reverse Polish (postfix) Notation. Valid operators are +, −, *, and /; division truncates toward zero. Return the integer the expression evaluates to. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 150
- Medium
- 1 approach
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StackLeetCode 150
Medium
The approach
- 01 Operand stack O(n)O(n) space
What you will learn
- How to read Evaluate Reverse Polish Notation and spot the stack pattern in it
- Operand stack: O(n) time, O(n) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Stack
See Evaluate Reverse Polish Notation run, step by step
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DSA comes with the all labs plan and every ChaiCode batch.