Commit 87bc969

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Merge pull request #282 from hellomrsun/master

Add C# solutions

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`@@ -16,6 +16,9 @@ Solutions in various programming languages are provided. Enjoy it.`
`16`	`16`	`7. [Word Pattern](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/07-Word-Pattern)`
`17`	`17`	`8. [Sum of Root To Leaf Binary Numbers](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/08-Sum-of-Root-To-Leaf-Binary-Numbers)`
`18`	`18`	`9. [Compare Version Numbers](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/09-Compare-Version-Numbers)`
	`19`	`+10. [Bulls and Cows](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/10-Bulls-and-Cows)`
	`20`	`+11. [Maximum Product Subarray](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/11-Maximum-Product-Subarray)`
	`21`	`+12. [Combination Sum III](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/12-Combination-Sum-III)`
`19`	`22`
`20`	`23`	`## August LeetCoding Challenge`
`21`	`24`	`Click [here](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge/) for problem descriptions.`

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`@@ -0,0 +1,20 @@`
	`1`	`+public class Solution {`
	`2`	`+ public string GetHint(string secret, string guess) {`
	`3`	`+ var bulls = 0;`
	`4`	`+ var cows = 0;`
	`5`	`+ int[] secretarr = new int[10];`
	`6`	`+ int[] guessarr = new int[10];`
	`7`	`+ for(int i=0; i<secret.Length; i++){`
	`8`	`+ if(secret[i] == guess[i]){`
	`9`	`+ bulls++;`
	`10`	`+ }else {`
	`11`	`+ ++secretarr[secret[i] - '0'];`
	`12`	`+ ++guessarr[guess[i] - '0'];`
	`13`	`+ }`
	`14`	`+ }`
	`15`	`+ for (int i = 0; i < 10; ++i) {`
	`16`	`+ cows += Math.Min(secretarr[i], guessarr[i]);`
	`17`	`+ }`
	`18`	`+ return bulls + "A" + cows + "B";`
	`19`	`+ }`
	`20`	`+}`

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`@@ -0,0 +1,17 @@`
	`1`	`+public class Solution {`
	`2`	`+ public int MaxProduct(int[] nums)`
	`3`	`+ {`
	`4`	`+ int s = nums[0];`
	`5`	`+ int r = nums[0];`
	`6`	`+`
	`7`	`+ for(int i=1, max = s, min = s; i<nums.Length; i++){`
	`8`	`+ int temp = max;`
	`9`	`+ max = Math.Max(Math.Max(nums[i] * max, nums[i] * min), nums[i]);`
	`10`	`+ min = Math.Min(Math.Min(nums[i] * temp, nums[i] * min), nums[i]);`
	`11`	`+`
	`12`	`+ r = Math.Max(max, r);`
	`13`	`+ }`
	`14`	`+`
	`15`	`+ return r;`
	`16`	`+ }`
	`17`	`+}`

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`@@ -0,0 +1,26 @@`
	`1`	`+public class Solution {`
	`2`	`+ public IList<IList<int>> CombinationSum3(int k, int n)`
	`3`	`+ {`
	`4`	`+ var res = new List<IList<int>>();`
	`5`	`+ var tmp = new List<int>();`
	`6`	`+ Backtrack(res, tmp, k, n, 1);`
	`7`	`+ return res;`
	`8`	`+ }`
	`9`	`+`
	`10`	`+ public void Backtrack(List<IList<int>> res, List<int> tmp, int k, int n, int idx)`
	`11`	`+ {`
	`12`	`+ if (k == tmp.Count && n == 0)`
	`13`	`+ {`
	`14`	`+ res.Add(new List<int>(tmp)); //Deep clone`
	`15`	`+ return;`
	`16`	`+ }`
	`17`	`+`
	`18`	`+ for (int i = idx; i <= n && k > 0 && n > 0; i++)`
	`19`	`+ {`
	`20`	`+ if(i>9) break;`
	`21`	`+ tmp.Add(i);`
	`22`	`+ Backtrack(res, tmp, k, n - i, i + 1);`
	`23`	`+ tmp.RemoveAt(tmp.Count - 1); //Remove last item when it doesn't find the correct combo`
	`24`	`+ }`
	`25`	`+ }`
	`26`	`+}`

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