Problem context and objectives
Mission briefing
Game event engineer · Actions arrive faster than the world can resolve them
Process events in the exact order promised by the data structure: The Postfix Engine.
The wrong removal order changes gameplay and creates impossible replays.
How you win
- 1Recognize when Operand stack evaluation matches the clues
- 2Keep this true after every move: the stack contains exactly the unresolved values produced by the processed tokens
- 3Reach the result within O(n)
Rules and pressure
- Target cost: O(n)
- State rule: the stack contains exactly the unresolved values produced by the processed tokens
Lesson 1 of 3
Socket order changes subtraction and division. First pop RIGHT, second pop LEFT: compute 8-3=5, then 5/2=2.
Your call · Stack after 8 3 -?