Stack problems

71 Stack DSA practice problems on CampusCode, each with statement, examples and constraints.

• 358. Add Two Numbers II (No Reverse Allowed) Medium Linked List
• 407. Sum of Two Numbers in Linked List Without Reverse Hard Linked List
• 564. Check Balanced Parentheses Easy Stack
• 565. Reverse a String Using Stack Easy Stack
• 566. Evaluate Postfix Expression Easy Stack
• 567. Convert Infix to Postfix Easy Stack
• 568. Reverse a Stack Using Recursion Easy Stack
• 569. Sort a Stack Using Recursion Easy Stack
• 570. Find Middle Element of Stack Easy Stack
• 571. Delete Middle Element of Stack Easy Stack
• 572. Check if Stack is Palindrome Easy Stack
• 573. Count Occurrences of Element in Stack Easy Stack
• 574. Reverse a Number Using Stack Easy Stack
• 575. Valid Parentheses (Multiple Types) Easy Stack
• 576. Remove All Adjacent Duplicates in String Easy Stack
• 577. Make String Great Easy Stack
• 578. Baseball Game Score Easy Stack
• 579. Reverse First K Elements of Queue Easy Stack
• 583. Check if Queue is Palindrome Easy Stack
• 589. Next Greater Element Easy Stack
• 590. Next Smaller Element Easy Stack
• 591. Previous Greater Element Easy Stack
• 592. Previous Smaller Element Easy Stack
• 593. Stock Span Problem Easy Stack
• 594. Next Greater Element I Easy Stack
• 595. Next Greater Element in Circular Array Easy Stack
• 596. Evaluate Prefix Expression Easy Stack
• 597. Balanced Brackets with Wildcard Easy Stack
• 598. Maximum Nesting Depth of Parentheses Easy Stack
• 600. Convert Decimal to Binary Using Stack Easy Stack
• 601. Delete Consecutive Same Words Easy Stack
• 602. Count Pairs of Matching Parentheses Easy Stack
• 603. Simplify Unix Directory Path Easy Stack
• 604. Score of Parentheses Easy Stack
• 606. Crawler Log Folder Easy Stack
• 608. Next Greater Element II (Circular Array) Medium Stack
• 609. Daily Temperatures Medium Stack
• 610. Largest Rectangle in Histogram Medium Stack
• 612. Decode String (Nested Brackets) Medium Stack
• 613. Asteroid Collision Medium Stack
• 614. 132 Pattern Medium Stack
• 616. Online Stock Span Medium Stack
• 617. Max Width Ramp Medium Stack
• 618. Exclusive Time of Functions Medium Stack
• 631. Number of Visible People in Queue Medium Stack
• 632. Build an Array With Stack Operations Medium Stack
• 633. Validate Stack Sequences Medium Stack
• 634. Count Collisions on a Road Medium Stack
• 635. Minimum Add to Make Parentheses Valid Medium Stack
• 636. Minimum Insertions to Balance Parentheses Medium Stack
• 637. Longest Valid Parentheses Medium Stack
• 638. Number of Atoms Medium Stack
• 646. Buildings With an Ocean View Medium Stack
• 648. Removing Stars From a String Medium Stack
• 649. Count of Students Unable to Eat Lunch Medium Stack
• 651. Check If Word Is Valid After Substitutions Medium Stack
• 652. Implement a Basic Calculator II Medium Stack
• 653. Trapping Rain Water Hard Stack
• 654. Largest Rectangle in Histogram (Optimal) Hard Stack
• 656. Basic Calculator I Hard Stack
• 657. Basic Calculator III Hard Stack
• 658. Longest Valid Parentheses (O(1) Space) Hard Stack
• 659. Remove Invalid Parentheses Hard Stack
• 660. Max Width Ramp (Optimal) Hard Stack
• 663. Number of Visible Pairs in a Queue Hard Stack
• 665. Minimum Swaps to Make String Balanced Hard Stack
• 686. Flatten Binary Tree to Linked List Hard Stack
• 874. Iterative Inorder Traversal Using Stack Easy Trees
• 890. Check if Array is Preorder of BST Easy Trees
• 911. Iterative Postorder Using One Stack Medium Trees
• 927. BST Iterator (In-Order Lazy Evaluation) Medium Trees