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Mixed Problems(Hard)
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1. Remove spaces
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2. Find key
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3. Series AP
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4. If-else
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5. Make it small
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6. 2 power
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7. Codeforces checking
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8. Following Directions
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9. Immediate Smaller
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10. Maximum Subarray Sum
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11. Firsrt time k
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12. Move Zeroes
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13. Count nodes
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14. Reverse Linked List
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15. Is Circular
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16. Remove it
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17. Remove it again!
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18. Stack with LL
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19. Next Greater
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20. Left Smallest
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21. Valid Parentheses
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22. Trapping Rain Water
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23. Skyscrapers (easy version)
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24. Skyscrapers (hard version)
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25. Queue through LL
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26. Queue using Two Stacks
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27. First Unique
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28. Recent Calls
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29. Design Circular Queue
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30. Buy tickets
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31. Sliding Maximum
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32. Truck Tour
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33. Snake and Ladder
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