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https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#leetcodeincsharp
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#list
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#detail
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#12-integer-to-roman
https://leetcode.com/problems/integer-to-roman/https://leetcode.com/problems/integer-to-roman/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/12_IntegerToRoman.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/12_IntegerToRoman.cs
refer to lucifer27's solutionhttps://leetcode.com/discuss/49870/my-java-solution-easy-to-understand
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#13-roman-to-integer
https://leetcode.com/problems/roman-to-integer/https://leetcode.com/problems/roman-to-integer/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/13_RomanToInteger.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/13_RomanToInteger.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#28-implement-strstr
https://leetcode.com/problems/implement-strstr/https://leetcode.com/problems/implement-strstr/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/28_ImplementStrStr.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/28_ImplementStrStr.cs
[StackOverFlowLink]http://stackoverflow.com/questions/32576677/issue-with-implementing-rabin-karp-algorithm-to-search-string-in-leetcode-28-im
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#35-search-insert-position
https://leetcode.com/problems/search-insert-position/https://leetcode.com/problems/search-insert-position/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/35_SearchInsertPosition.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/35_SearchInsertPosition.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#53-maximun-subarray
https://leetcode.com/problems/maximum-subarray/https://leetcode.com/problems/maximum-subarray/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/53_MaximumSubarray.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/53_MaximumSubarray.cs
xi11's solutionhttps://leetcode.com/discuss/38913/o-n-time-o-1-space-dp-solution-java
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#66-plus-one
https://leetcode.com/problems/plus-one/https://leetcode.com/problems/plus-one/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/66_PlusOne.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/66_PlusOne.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#70-climbing-stairs
https://leetcode.com/problems/climbing-stairs/https://leetcode.com/problems/climbing-stairs/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/70_ClimbingStairs.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/70_ClimbingStairs.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#83-remove-duplicates-from-sorted-list
https://leetcode.com/problems/remove-duplicates-from-sorted-list/https://leetcode.com/problems/remove-duplicates-from-sorted-list/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/83_RemoveDuplicatesFromSortedList.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/83_RemoveDuplicatesFromSortedList.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#94-binary-tree-in-order-traversal
https://leetcode.com/problems/binary-tree-inorder-traversal/https://leetcode.com/problems/binary-tree-inorder-traversal/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/94_BinaryTreeInOrderTraversal.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/94_BinaryTreeInOrderTraversal.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#96-unique-binary-search-trees
https://leetcode.com/problems/unique-binary-search-trees/https://leetcode.com/problems/unique-binary-search-trees/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/96_UniqueBinarySearchTrees.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/96_UniqueBinarySearchTrees.cs
rain4's solutionhttps://leetcode.com/discuss/55761/c%23-accepted-52ms-based-on-the-quora-answer
Mohit modi's explanationhttps://www.quora.com/Given-n-how-many-structurally-unique-BSTs-binary-search-trees-that-store-values-1-to-n-are-there
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#100-same-tree
https://leetcode.com/problems/same-tree/https://leetcode.com/problems/same-tree/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/100_SameTree.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/100_SameTree.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#104-maximum-depth-of-a-binary-tree
https://leetcode.com/problems/maximum-depth-of-binary-tree/https://leetcode.com/problems/maximum-depth-of-binary-tree/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/104_MaximumDepthOfABinaryTree.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/104_MaximumDepthOfABinaryTree.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#107-level-order-binary-tree-traversal-ii
https://leetcode.com/problems/binary-tree-level-order-traversal-ii/https://leetcode.com/problems/binary-tree-level-order-traversal-ii/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/107_LevelOrderBinaryTreeTraversalII.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/107_LevelOrderBinaryTreeTraversalII.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#116-populating-next-right-pointers-in-each-node
https://leetcode.com/problems/populating-next-right-pointers-in-each-node/https://leetcode.com/problems/populating-next-right-pointers-in-each-node/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/116_PopulatingNextRightPointersInEachNode.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/116_PopulatingNextRightPointersInEachNode.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#122-best-time-to-buy-and-sell-stack-ii
https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/122_BestTimeToBuyAndSellStockII.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/122_BestTimeToBuyAndSellStockII.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#136-single-number
https://leetcode.com/problems/single-number/https://leetcode.com/problems/single-number/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/136_SingleNumber.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/136_SingleNumber.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#137-single-number-ii
https://leetcode.com/problems/single-number-ii/https://leetcode.com/problems/single-number-ii/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/137_SingleNumberII.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/137_SingleNumberII.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#141-linked-list-cycle
https://leetcode.com/problems/linked-list-cycle/https://leetcode.com/problems/linked-list-cycle/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/141_LinkedListCycle.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/141_LinkedListCycle.cs
[huxijiuhao's solution]https://leetcode.com/discuss/54343/simple-and-easy-understanding-java-solution-time-n-space-o-1
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#144-binary-tree-pre-order-traversal
https://leetcode.com/problems/binary-tree-preorder-traversal/https://leetcode.com/problems/binary-tree-preorder-traversal/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/144_BinaryTreePreOrderTraversal.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/144_BinaryTreePreOrderTraversal.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#168-excel-sheet-column-title
https://leetcode.com/problems/excel-sheet-column-title/https://leetcode.com/problems/excel-sheet-column-title/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/168_ExcelSheetColumnTitle.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/168_ExcelSheetColumnTitle.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#169-majority-element
https://leetcode.com/problems/majority-element/https://leetcode.com/problems/majority-element/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/169_MajorityElement.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/169_MajorityElement.cs
[andy-sheng's solution]https://leetcode.com/discuss/45660/my-o-n-time-and-o-1-space-solution-in-c
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#171-excel-sheet-column-number
https://leetcode.com/problems/excel-sheet-column-number/https://leetcode.com/problems/excel-sheet-column-number/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/171_ExcelSheetColumnNumber.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/171_ExcelSheetColumnNumber.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#191-number-of-1-bits
https://leetcode.com/problems/number-of-1-bits/https://leetcode.com/problems/number-of-1-bits/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/191_NumberOf1Bits.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/191_NumberOf1Bits.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#217-contains-duplicate
https://leetcode.com/problems/contains-duplicate/https://leetcode.com/problems/contains-duplicate/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/217_ContainsDuplicate.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/217_ContainsDuplicate.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#226-invert-binary-tree
https://leetcode.com/problems/invert-binary-tree/https://leetcode.com/problems/invert-binary-tree/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/226_InvertBinaryTree.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/226_InvertBinaryTree.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#235-lowest-common-ancestor-of-a-binary-search-tree
https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/235_LowestCommonAncestorOfABinarySearchTree.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/235_LowestCommonAncestorOfABinarySearchTree.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#237-delete-node-in-a-linked-list
https://leetcode.com/problems/delete-node-in-a-linked-list/https://leetcode.com/problems/delete-node-in-a-linked-list/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/237_DeleteNodeInALinkedList.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/237_DeleteNodeInALinkedList.cs
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#238-product-of-array-except-self
https://leetcode.com/problems/product-of-array-except-self/https://leetcode.com/problems/product-of-array-except-self/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/238_ProductofArrayExceptSelf.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/238_ProductofArrayExceptSelf.cs
[areshead's solution]https://leetcode.com/discuss/53781/my-solution-beats-100%25-java-solutions
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#242-valid-anagram
https://leetcode.com/problems/valid-anagram/https://leetcode.com/problems/valid-anagram/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/242_ValidAnagram.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/242_ValidAnagram.cs
零一's solutionhttps://leetcode.com/discuss/57355/0ms-c-solution-o-n-time
https://patch-diff.githubusercontent.com/BeginnerL/LeetCodeInCSharp#258-add-digits
https://leetcode.com/problems/add-digits/https://leetcode.com/problems/add-digits/
https://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/258_AddDigits.cshttps://github.com/scottszb1987/LeetCodeInCSharp/blob/master/LeetCodeInCSharp/258_AddDigits.cs
[Wikipedia reference]https://en.wikipedia.org/wiki/Digital_root
[reference]http://stackoverflow.com/questions/478968/sum-of-digits-in-c-sharp
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