82 - Double Ended Queue | Input-Restricted and Output-Restricted Deque | Data Structure

#DoubleEndedQueue #Deque #DataStructure #Queue #Algorithms #DSA

Deque - Double-Ended Queue :

Types:
1. Input-Restricted – Insert at rear, delete from both ends.
2. Output-Restricted – Insert at both ends, delete from front.

Operations (O(1) time):
- push_front/back(), pop_front/back(), front(), back(), isEmpty(), size().

Applications:
- Sliding Window, LRU Cache, Palindrome Checking, Undo/Redo.

Implementations:
1. Array (Circular) – Fixed size, efficient, limited flexibility.
2. Doubly Linked List – Dynamic, extra memory for pointers.
3. Two Stacks – Uses two stacks, O(1) amortized operations.

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📝 Timestamps:
0:00 - intro double ended queue
1:09 - DEque Operations
2:37 - Types of Double Ended Queue
3:40 - Application
4:26 - Implement Double Ended Queue
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