Stack & Queue

Basic stack/queue usage, the monotonic-stack pattern (next greater element family), expression evaluation, and deque-based sliding window problems.

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Problem	Difficulty	Platform	Action
Valid Parentheses	Easy	LC	Solve
Parenthesis Checker	Easy	GFG	Solve
Min Stack	Medium	LC	Solve
Baseball Game	Easy	LC	Solve
Implement Queue using Stacks	Easy	LC	Solve
Queue using Stacks	Easy	GFG	Solve
Implement Stack using Queues	Easy	LC	Solve
Stack using Two Queues	Easy	GFG	Solve
Remove All Adjacent Duplicates In String	Easy	LC	Solve
Backspace String Compare	Easy	LC	Solve
Design Circular Queue	Medium	LC	Solve