Stack & Queue Monster
LIFO vs FIFO — Compare both data structures with live stats, animations, and challenge mode.
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Current Size
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Total Pushes
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Total Pops
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Peak Size
STACK — LIFO
Operation Log
Push or Enqueue elements to get started. Switch modes with the tabs above.
Challenge Mode
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Test your knowledge! Predict what's at the top after operations.
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⚡ Time Complexity
Push / Enqueue
O(1)
Pop / Dequeue
O(1)
Peek / Front
O(1)
Search
O(n)
Space
O(n)
🧠 Key Concepts
Stack (LIFO): Last-In, First-Out.
Think of a stack of plates — you add and remove from the top.
Queue (FIFO): First-In, First-Out.
Think of a queue at a store — first come, first served.