some changes

Array problems/Arrays/..py

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+# 
+# Link: 

Array problems/Arrays/1..Two.py

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+# 1. Two Sum
+# Link: https://leetcode.com/problems/two-sum/

Array problems/Arrays/10..Squares.py

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+# 10. Squares of a Sorted Array
+# Link: https://leetcode.com/problems/squares-of-a-sorted-array/

Array problems/Arrays/11..Pascal's.py

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+# 11. Pascal's Triangle
+# Link: https://leetcode.com/problems/pascals-triangle/

Array problems/Arrays/12..Remove.py

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+# 12. Remove Duplicates from Sorted Array
+# Link: https://leetcode.com/problems/remove-duplicates-from-sorted-array/

Array problems/Arrays/13..Merge.py

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+# 13. Merge Intervals
+# Link: https://leetcode.com/problems/merge-intervals/

Array problems/Arrays/14..3Sum.py

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+# 14. 3Sum
+# Link: https://leetcode.com/problems/3sum/

Array problems/Arrays/15..Product.py

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+# 15. Product of Array Except Self
+# Link: https://leetcode.com/problems/product-of-array-except-self/

Array problems/Arrays/16..Insert.py

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+# 16. Insert Delete GetRandom O(1)
+# Link: https://leetcode.com/problems/insert-delete-getrandom-o1/

Array problems/Arrays/17..Subarray.py

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+# 17. Subarray Sum Equals K
+# Link: https://leetcode.com/problems/subarray-sum-equals-k/

Array problems/Arrays/18..Next.py

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+# 18. Next Permutation
+# Link: https://leetcode.com/problems/next-permutation/

Array problems/Arrays/19..Spiral.py

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+# 19. Spiral Matrix
+# Link: https://leetcode.com/problems/spiral-matrix/

Array problems/Arrays/2..Best.py

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+# 2. Best Time to Buy and Sell Stock
+# Link: https://leetcode.com/problems/best-time-to-buy-and-sell-stock/

Array problems/Arrays/20..Container.py

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+# 20. Container With Most Water
+# Link: https://leetcode.com/problems/container-with-most-water/

Array problems/Arrays/21..Rotate.py

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+# 21. Rotate Image
+# Link: https://leetcode.com/problems/rotate-image/

Array problems/Arrays/22..Word.py

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+# 22. Word Search
+# Link: https://leetcode.com/problems/word-search/

Array problems/Arrays/23..3Sum.py

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+# 23. 3Sum Closest
+# Link: https://leetcode.com/problems/3sum-closest/

Array problems/Arrays/24..Game.py

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+# 24. Game of Life
+# Link: https://leetcode.com/problems/game-of-life/

Array problems/Arrays/25..Pairs.py

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+# 25. Pairs of Songs With Total Durations Divisible by 60
+# Link: https://leetcode.com/problems/pairs-of-songs-with-total-durations-divisible-by-60/

Array problems/Arrays/26..4Sum.py

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+# 26. 4Sum
+# Link: https://leetcode.com/problems/4sum/

Array problems/Arrays/27..Find.py

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+# 27. Find the Duplicate Number
+# Link: https://leetcode.com/problems/find-the-duplicate-number/

Array problems/Arrays/28..Combination.py

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+# 28. Combination Sum
+# Link: https://leetcode.com/problems/combination-sum/

Array problems/Arrays/29..Jump.py

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+# 29. Jump Game II
+# Link: https://leetcode.com/problems/jump-game-ii/

Array problems/Arrays/3..Plus.py

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+# 3. Plus One
+# Link: https://leetcode.com/problems/plus-one/

Array problems/Arrays/30..Maximum.py

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+# 30. Maximum Points You Can Obtain from Cards
+# Link: https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/

Array problems/Arrays/31..Maximum.py

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+# 31. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
+# Link: https://leetcode.com/problems/maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts/

Array problems/Arrays/32..Max.py

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+# 32. Max Area of Island
+# Link: https://leetcode.com/problems/max-area-of-island/

Array problems/Arrays/33..Find.py

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+# 33. Find All Duplicates in an Array
+# Link: https://leetcode.com/problems/find-all-duplicates-in-an-array/

Array problems/Arrays/34..K-Diff.py

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+# 34. K-Diff Pairs in an Array
+# Link: https://leetcode.com/problems/k-diff-pairs-in-an-array/

Array problems/Arrays/35..Subsets.py

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+# 35. Subsets
+# Link: https://leetcode.com/problems/subsets/

Array problems/Arrays/36..Invalid.py

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+# 36. Invalid Transactions
+# Link: https://leetcode.com/problems/invalid-transactions/

Array problems/Arrays/37..Jump.py

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+# 37. Jump Game
+# Link: https://leetcode.com/problems/jump-game/

Array problems/Arrays/38..Subarray.py

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+# 38. Subarray Sums Divisible by K
+# Link: https://leetcode.com/problems/subarray-sums-divisible-by-k/

Array problems/Arrays/4..Move.py

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+# 4. Move Zeroes
+# Link: https://leetcode.com/problems/move-zeroes/

Array problems/Arrays/5..Best.py

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+# 5. Best Time to Buy and Sell Stock II
+# Link: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/

Array problems/Arrays/6..Running.py

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+# 6. Running Sum of 1d Array
+# Link: https://leetcode.com/problems/running-sum-of-1d-array/

Array problems/Arrays/7..Find.py

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+# 7. Find Pivot Index
+# Link: https://leetcode.com/problems/find-pivot-index/

Array problems/Arrays/8..Majority.py

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+# 8. Majority Element
+# Link: https://leetcode.com/problems/majority-element/

Array problems/Arrays/9..Fibonacci.py

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+# 9. Fibonacci Number
+# Link: https://leetcode.com/problems/fibonacci-number/

Array problems/Recursion/..py

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+# 
+# Link: 

Array problems/Recursion/1..What.py

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+# 1. What is Recursion
+# Link: https://leetcode.com/problems/powx-n/

Array problems/Recursion/10..Combination.py

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+# 10. Combination Sum II
+# Link: https://leetcode.com/problems/combination-sum-ii/

Array problems/Recursion/11..Combination.py

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+# 11. Combination Sum III
+# Link: https://leetcode.com/problems/combination-sum-iii/

Array problems/Recursion/12..Letter.py

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+# 12. Letter Combinations of a Phone Number
+# Link: https://leetcode.com/problems/letter-combinations-of-a-phone-number/

Array problems/Recursion/13..Partition.py

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+# 13. Partition to K Equal Sum Subsets
+# Link: https://leetcode.com/problems/partition-to-k-equal-sum-subsets/

Array problems/Recursion/14..Maximum.py

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+# 14. Maximum Length of a Concatenated String with Unique Characters
+# Link: https://leetcode.com/problems/maximum-length-of-a-concatenated-string-with-unique-characters/

Array problems/Recursion/15..Flood.py

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+# 15. Flood Fill
+# Link: https://leetcode.com/problems/flood-fill/

Array problems/Recursion/16..Word.py

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+# 16. Word Search
+# Link: https://leetcode.com/problems/word-search/

Array problems/Recursion/17..Rat.py

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+# 17. Rat in a Maze
+# Link: https://leetcode.com/problems/n-queens/

Array problems/Recursion/2..How.py

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+# 2. How Recursion Works
+# Link: https://leetcode.com/problems/valid-palindrome/

Array problems/Recursion/3..What.py

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+# 3. What is a Recursion Tree
+# Link: https://leetcode.com/problems/subsets/

Array problems/Recursion/4..Subsets.py

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+# 4. Subsets
+# Link: https://leetcode.com/problems/subsets/

Array problems/Recursion/5..Permutations.py

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+# 5. Permutations
+# Link: https://leetcode.com/problems/permutations/

Array problems/Recursion/6..Permutations.py

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+# 6. Permutations II
+# Link: https://leetcode.com/problems/permutations-ii/

Array problems/Recursion/7..Subsets.py

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+# 7. Subsets II
+# Link: https://leetcode.com/problems/subsets-ii/

Array problems/Recursion/8..Combinations.py

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+# 8. Combinations
+# Link: https://leetcode.com/problems/combinations/

Array problems/Recursion/9..Combination.py

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+# 9. Combination Sum
+# Link: https://leetcode.com/problems/combination-sum/

Hashing/Hashing 1.ipynb

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   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "fb8b0287",
+   "id": "50235cc4",
    "metadata": {},
    "outputs": [],
    "source": []

Hashing/easy/1_Verifying_An_Alien_Dictionary.py

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+# Problem: Verifying_An_Alien_Dictionary
+# URL: https://leetcode.com/problems/verifying-an-alien-dictionary/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://leetcode.com/problems/verifying-an-alien-dictionary/
+    pass

Hashing/easy/2_Design_Hashmap.py

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+# Problem: Design_Hashmap
+# URL: https://leetcode.com/problems/design-hashmap/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://leetcode.com/problems/design-hashmap/
+    pass

Hashing/medium/10_Maximum_Repeating_Number.py

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+# Problem: Maximum_Repeating_Number
+# URL: https://www.geeksforgeeks.org/find-the-maximum-repeating-number-in-ok-time/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/find-the-maximum-repeating-number-in-ok-time/
+    pass

Hashing/medium/11_Kth_Smallest_Element_Removing_Integers.py

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+# Problem: Kth_Smallest_Element_Removing_Integers
+# URL: https://www.geeksforgeeks.org/k-th-smallest-element-removing-integers-natural-numbers/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/k-th-smallest-element-removing-integers-natural-numbers/
+    pass

Hashing/medium/12_Find_K_Closest_Elements.py

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+# Problem: Find_K_Closest_Elements
+# URL: https://www.geeksforgeeks.org/find-k-closest-elements-given-value/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/find-k-closest-elements-given-value/
+    pass

Hashing/medium/13_Kth_Largest_Element_In_Stream.py

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+# Problem: Kth_Largest_Element_In_Stream
+# URL: https://www.geeksforgeeks.org/kth-largest-element-in-a-stream/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/kth-largest-element-in-a-stream/
+    pass

Hashing/medium/14_Connect_N_Ropes_Minimum_Cost.py

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+# Problem: Connect_N_Ropes_Minimum_Cost
+# URL: https://www.geeksforgeeks.org/connect-n-ropes-minimum-cost/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/connect-n-ropes-minimum-cost/
+    pass

Hashing/medium/15_Cuckoo_Hashing.py

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+# Problem: Cuckoo_Hashing
+# URL: https://www.geeksforgeeks.org/cuckoo-hashing/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/cuckoo-hashing/
+    pass

Hashing/medium/16_Find_Itinerary_From_List_Of_Tickets.py

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+# Problem: Find_Itinerary_From_List_Of_Tickets
+# URL: https://www.geeksforgeeks.org/find-itinerary-from-a-given-list-of-tickets/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/find-itinerary-from-a-given-list-of-tickets/
+    pass

Hashing/medium/17_Largest_Subarray_With_0_Sum.py

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+# Problem: Largest_Subarray_With_0_Sum
+# URL: http://geeksforgeeks.org/find-the-largest-subarray-with-0-sum/
+
+def solution():
+    # TODO: Implement the solution for the problem at http://geeksforgeeks.org/find-the-largest-subarray-with-0-sum/
+    pass

Hashing/medium/18_Count_Distinct_Elements_In_Every_Window.py

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+# Problem: Count_Distinct_Elements_In_Every_Window
+# URL: https://www.geeksforgeeks.org/count-distinct-elements-in-every-window-of-size-k/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/count-distinct-elements-in-every-window-of-size-k/
+    pass

Hashing/medium/19_Group_Shifted_String.py

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+# Problem: Group_Shifted_String
+# URL: https://www.geeksforgeeks.org/group-shifted-string/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/group-shifted-string/
+    pass

Hashing/medium/20_Merge_K_Sorted_Lists.py

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+# Problem: Merge_K_Sorted_Lists
+# URL: https://leetcode.com/problems/merge-k-sorted-lists/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://leetcode.com/problems/merge-k-sorted-lists/
+    pass

Hashing/medium/21_Find_Median_From_Data_Stream.py

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+# Problem: Find_Median_From_Data_Stream
+# URL: https://leetcode.com/problems/find-median-from-data-stream/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://leetcode.com/problems/find-median-from-data-stream/
+    pass

Hashing/medium/22_Sliding_Window_Maximum.py

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+# Problem: Sliding_Window_Maximum
+# URL: https://www.geeksforgeeks.org/sliding-window-maximum-maximum-of-all-subarrays-of-size-k/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/sliding-window-maximum-maximum-of-all-subarrays-of-size-k/
+    pass

Hashing/medium/23_Smallest_Positive_Number_Missing.py

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+# Problem: Smallest_Positive_Number_Missing
+# URL: https://www.geeksforgeeks.org/find-the-smallest-positive-number-missing-from-an-unsorted-array/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/find-the-smallest-positive-number-missing-from-an-unsorted-array/
+    pass

Hashing/medium/24_Surpasser_Count_Of_Each_Element.py

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+# Problem: Surpasser_Count_Of_Each_Element
+# URL: https://www.geeksforgeeks.org/find-surpasser-count-of-each-element-in-array/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/find-surpasser-count-of-each-element-in-array/
+    pass

Hashing/medium/25_Tournament_Tree_And_Binary_Heap.py

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+# Problem: Tournament_Tree_And_Binary_Heap
+# URL: https://www.geeksforgeeks.org/tournament-tree-and-binary-heap/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/tournament-tree-and-binary-heap/
+    pass

Hashing/medium/26_Palindrome_Check_In_Stream.py

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+# Problem: Palindrome_Check_In_Stream
+# URL: https://www.geeksforgeeks.org/online-algorithm-for-checking-palindrome-in-a-stream/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/online-algorithm-for-checking-palindrome-in-a-stream/
+    pass

Hashing/medium/3_Top_K_Frequent_Elements.py

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+# Problem: Top_K_Frequent_Elements
+# URL: https://leetcode.com/problems/top-k-frequent-elements/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://leetcode.com/problems/top-k-frequent-elements/
+    pass

Hashing/medium/4_Design_Twitter.py

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+# Problem: Design_Twitter
+# URL: https://leetcode.com/problems/design-twitter/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://leetcode.com/problems/design-twitter/
+    pass

Hashing/medium/5_K_Numbers_Difference.py

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+# Problem: K_Numbers_Difference
+# URL: https://www.geeksforgeeks.org/k-numbers-difference-maximum-minimum-k-number-minimized/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/k-numbers-difference-maximum-minimum-k-number-minimized/
+    pass

Hashing/medium/6_Heap_Sort.py

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+# Problem: Heap_Sort
+# URL: https://www.geeksforgeeks.org/heap-sort/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/heap-sort/
+    pass

Hashing/medium/7_K_Largest_Or_Smallest_Elements.py

@@ -0,0 +1,6 @@
+# Problem: K_Largest_Or_Smallest_Elements
+# URL: https://www.geeksforgeeks.org/k-largestor-smallest-elements-in-an-array/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/k-largestor-smallest-elements-in-an-array/
+    pass

Hashing/medium/8_Next_Greater_Element.py

@@ -0,0 +1,6 @@
+# Problem: Next_Greater_Element
+# URL: https://www.geeksforgeeks.org/next-greater-element/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/next-greater-element/
+    pass

Hashing/medium/9_Kth_Smallest_Largest_Element.py

@@ -0,0 +1,6 @@
+# Problem: Kth_Smallest_Largest_Element
+# URL: https://www.geeksforgeeks.org/kth-smallestlargest-element-unsorted-array/
+
+def solution():
+    # TODO: Implement the solution for the problem at https://www.geeksforgeeks.org/kth-smallestlargest-element-unsorted-array/
+    pass