add lc links

Author: mahendra-rk

README.md

@@ -320,6 +320,89 @@ You can also refer to my [Java Notes](http://blog.rampatra.com/category/java) fo
     6. [Recursion and DP](/src/main/java/com/ctci/recursionanddp)
        - [FibonacciNumber](/src/main/java/com/ctci/recursionanddp/FibonacciNumber.java)
 3. [LeetCode](/src/main/java/com/leetcode).
+    1. [arrays](/src/main/java/com/leetcode/arrays)
+       - [BuySellStocks](/src/main/java/com/leetcode/arrays/BuySellStocks.java)
+       - [BuySellStocksII](/src/main/java/com/leetcode/arrays/BuySellStocksII.java)
+       - [CanPlaceFlowers](/src/main/java/com/leetcode/arrays/CanPlaceFlowers.java)
+       - [FindTheCelebrity](/src/main/java/com/leetcode/arrays/FindTheCelebrity.java)
+       - [InsertInterval](/src/main/java/com/leetcode/arrays/InsertInterval.java)
+       - [MajorityElement](/src/main/java/com/leetcode/arrays/MajorityElement.java)
+       - [MergeIntervals](/src/main/java/com/leetcode/arrays/MergeIntervals.java)
+       - [MergeSortedArray](/src/main/java/com/leetcode/arrays/MergeSortedArray.java)
+       - [NumberOfIslands](/src/main/java/com/leetcode/arrays/NumberOfIslands.java)
+       - [PascalsTriangle](/src/main/java/com/leetcode/arrays/PascalsTriangle.java)
+       - [RemoveDuplicates](/src/main/java/com/leetcode/arrays/RemoveDuplicates.java)
+       - [RotateArray](/src/main/java/com/leetcode/arrays/RotateArray.java)
+       - [ShortestWordDistance](/src/main/java/com/leetcode/arrays/ShortestWordDistance.java)
+       - [ShortestWordDistanceIII](/src/main/java/com/leetcode/arrays/ShortestWordDistanceIII.java)
+       - [SparseMatrixMultiplication](/src/main/java/com/leetcode/arrays/SparseMatrixMultiplication.java)
+       - [ValidTriangleNumber](/src/main/java/com/leetcode/arrays/ValidTriangleNumber.java)
+       - [binarysearch](/src/main/java/com/leetcode/arrays/binarysearch)
+    2. [design](/src/main/java/com/leetcode/design)
+       - [AllOne](/src/main/java/com/leetcode/design/AllOne.java)
+       - [DesignHitCounter](/src/main/java/com/leetcode/design/DesignHitCounter.java)
+       - [InsertDeleteGetRandom](/src/main/java/com/leetcode/design/InsertDeleteGetRandom.java)
+       - [LFUCache](/src/main/java/com/leetcode/design/LFUCache.java)
+       - [LRUCache](/src/main/java/com/leetcode/design/LRUCache.java)
+    3. [dynamicprogramming](/src/main/java/com/leetcode/dynamicprogramming)
+       - [MaximumProductSubArray](/src/main/java/com/leetcode/dynamicprogramming/MaximumProductSubArray.java)
+       - [MaximumSubArray](/src/main/java/com/leetcode/dynamicprogramming/MaximumSubArray.java)
+       - [PaintHouse](/src/main/java/com/leetcode/dynamicprogramming/PaintHouse.java)
+       - [PaintHouseII](/src/main/java/com/leetcode/dynamicprogramming/PaintHouseII.java)
+    4. [graphs](/src/main/java/com/leetcode/graphs)
+       - [GraphValidTree](/src/main/java/com/leetcode/graphs/GraphValidTree.java)
+       - [WordLadder](/src/main/java/com/leetcode/graphs/WordLadder.java)
+       - [WordLadderII](/src/main/java/com/leetcode/graphs/WordLadderII.java)
+    5. [hashtables](/src/main/java/com/leetcode/hashtables)
+       - [ContainsDuplicates](/src/main/java/com/leetcode/hashtables/ContainsDuplicates.java)
+       - [IsomorphicStrings](/src/main/java/com/leetcode/hashtables/IsomorphicStrings.java)
+       - [MyHashMap](/src/main/java/com/leetcode/hashtables/MyHashMap.java)
+       - [MyHashSet](/src/main/java/com/leetcode/hashtables/MyHashSet.java)
+       - [RepeatedDnaSequence](/src/main/java/com/leetcode/hashtables/RepeatedDnaSequence.java)
+       - [ShortestWordDistanceII](/src/main/java/com/leetcode/hashtables/ShortestWordDistanceII.java)
+       - [TwoSumIII](/src/main/java/com/leetcode/hashtables/TwoSumIII.java)
+       - [slidingwindow](/src/main/java/com/leetcode/hashtables/slidingwindow)
+    6. [heaps](/src/main/java/com/leetcode/heaps)
+       - [KthLargestElementInArray](/src/main/java/com/leetcode/heaps/KthLargestElementInArray.java)
+       - [TopKFrequentElements](/src/main/java/com/leetcode/heaps/TopKFrequentElements.java)
+    7. [linkedlists](/src/main/java/com/leetcode/linkedlists)
+       - [AddOneToNumberInList](/src/main/java/com/leetcode/linkedlists/AddOneToNumberInList.java)
+       - [LinkedListCycleII](/src/main/java/com/leetcode/linkedlists/LinkedListCycleII.java)
+       - [Node](/src/main/java/com/leetcode/linkedlists/Node.java)
+    8. [math](/src/main/java/com/leetcode/math)
+       - [BestMeetingPoint](/src/main/java/com/leetcode/math/BestMeetingPoint.java)
+       - [ExcelSheetColumnNumber](/src/main/java/com/leetcode/math/ExcelSheetColumnNumber.java)
+       - [ReverseInteger](/src/main/java/com/leetcode/math/ReverseInteger.java)
+    9. [recursion](/src/main/java/com/leetcode/recursion)
+       - [BestMeetingPoint](/src/main/java/com/leetcode/recursion/BestMeetingPoint.java)
+       - [ExcelSheetColumnNumber](/src/main/java/com/leetcode/recursion/ExcelSheetColumnNumber.java)
+       - [ReverseInteger](/src/main/java/com/leetcode/recursion/ReverseInteger.java)
+    10. [stacks](/src/main/java/com/leetcode/stacks)
+        - [ExclusiveTimeOfFunctions](/src/main/java/com/leetcode/stacks/ExclusiveTimeOfFunctions.java)
+        - [ReversePolishNotation](/src/main/java/com/leetcode/stacks/ReversePolishNotation.java)
+    11. [strings](/src/main/java/com/leetcode/strings)
+        - [AnagramsInString](/src/main/java/com/leetcode/strings/AnagramsInString.java)
+        - [CountAndSay](/src/main/java/com/leetcode/strings/CountAndSay.java)
+        - [LongestCommonPrefix](/src/main/java/com/leetcode/strings/LongestCommonPrefix.java)
+        - [RansomNote](/src/main/java/com/leetcode/strings/RansomNote.java)
+        - [ReverseStringII](/src/main/java/com/leetcode/strings/ReverseStringII.java)
+        - [ReverseVowels](/src/main/java/com/leetcode/strings/ReverseVowels.java)
+        - [StrStr](/src/main/java/com/leetcode/strings/StrStr.java)
+        - [StringCompression](/src/main/java/com/leetcode/strings/StringCompression.java)
+        - [UniqueCharacterInString](/src/main/java/com/leetcode/strings/UniqueCharacterInString.java)
+        - [ValidPalindrome](/src/main/java/com/leetcode/strings/ValidPalindrome.java)
+    12. [trees](/src/main/java/com/leetcode/trees)
+        - [BinaryTreeUpsideDown](/src/main/java/com/leetcode/trees/BinaryTreeUpsideDown.java)
+        - [BinaryTreeZigZagLevelOrderTraversal](/src/main/java/com/leetcode/trees/BinaryTreeZigZagLevelOrderTraversal.java)
+        - [ClosestBinarySearchTreeValue](/src/main/java/com/leetcode/trees/ClosestBinarySearchTreeValue.java)
+        - [ClosestBinarySearchTreeValueII](/src/main/java/com/leetcode/trees/ClosestBinarySearchTreeValueII.java)
+        - [LeavesOfBinaryTree](/src/main/java/com/leetcode/trees/LeavesOfBinaryTree.java)
+        - [SecondMinNodeInBinaryTree](/src/main/java/com/leetcode/trees/SecondMinNodeInBinaryTree.java)
+        - [SerializeDeserializeBinaryTree](/src/main/java/com/leetcode/trees/SerializeDeserializeBinaryTree.java)
+        - [SymmetricTree](/src/main/java/com/leetcode/trees/SymmetricTree.java)
+        - [TreeNode](/src/main/java/com/leetcode/trees/TreeNode.java)
+    13. [trie](/src/main/java/com/leetcode/trie)
+        - [LongestWord](/src/main/java/com/leetcode/trie/LongestWord.java)
 4. [HackerRank](/src/main/java/com/hackerrank).