readme

Author: jackzhenguo

README.md

@@ -1,3 +1,52 @@
+# `Today Update`
+## Math
+### 9 Palindrome Number
+*  [Github:#9 Palindrome Number](/Math/Math.Lib/IssPalindromeSln.cs)
+*  [CSDN:#9 Palindrome Number](http://blog.csdn.net/daigualu/article/details/72717009)
+   ```C#
+      public bool IsPalindrome(int x)
+        {
+            int palindromex = 0, tmp = x;
+            int sumbit = 0;
+            //calcuate bit count
+            while (tmp > 0)
+            {
+                sumbit++;
+                tmp /= 10;
+            }
+            tmp = x;
+            //get a number reversely
+            while (tmp > 0)
+            {
+                //if palindromex happens overflow, it would return false;
+                palindromex += tmp % 10 * (int)System.Math.Pow(10, --sumbit);               
+                tmp /= 10;
+            }
+            return palindromex == x;
+        }
+   ```
+
+### 171 Excel Sheet Column Number
+*  [Github:#171 Excel Sheet Column Number](/Math/Math.Lib/ExcelColumnNumberSln.cs)
+*  [CSDN:#171 Excel Sheet Column Number](http://blog.csdn.net/daigualu/article/details/72717145)
+  	 ```C#
+	    public int TitleToNumber(string s)
+        {
+            char[] chs= {'A','B','C','D','E','F','G','H','I','J','K',
+            'L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};   
+            Dictionary<char,int> dict = new Dictionary<char,int>();
+            for(int i=0; i<chs.Length;i++) dict.Add(chs[i],i+1);
+            int scnt = s.Length, rtnsum=0;
+            for (int i = scnt - 1,j=0; i >= 0; i--,j++)
+              rtnsum += dict[s[i]] * (int)System.Math.Pow(26, j);
+            return rtnsum;
+        }
+
+	 ```
+---
+---
+
+
 # About it
 Algorithm is tool for exercising our thinking patterns, and we can strengthen the ability to convert mathematical models into code. Whether you are engaged in artificial intelligence, in-depth learning, or advanced software development, no matter what language you use, such as C#,C++,Java,python,etc., and applying the most appropriate algorithm is always the most important point when faced with a specific problem. *Every problem in practice has its own particularity, which makes it not that easier to choose the most appropriate algorithm.* How do we write the algorithm that most efficiently apply to a practical issue? **Yes, LeetCode.** You can write an algorithm until it accepted, and do not rush to do the next question, and learn the solution someone else has submitted, `so you can solve the problem from the ability of solving the problem to that fast and efficient realm`. 
 
@@ -12,19 +61,6 @@ Anyway, welcome to view, star and fork, then contribute.
 4. Push to the branch: git push origin my-leetcode-csharp
 5. Submit a pull request and enjoy! :D
 
-## `Today Update`
-### Math
-#### 9 Palindrome Number
-*  [Github:#9 Palindrome Number](/Math/Math.Lib/IssPalindromeSln.cs)
-*  [CSDN:#9 Palindrome Number](http://blog.csdn.net/daigualu/article/details/72717009)
-
-#### 171 Excel Sheet Column Number
-*  [Github:#171 Excel Sheet Column Number](/Math/Math.Lib/ExcelColumnNumberSln.cs)
-*  [CSDN:#171 Excel Sheet Column Number](http://blog.csdn.net/daigualu/article/details/72717145)
-  	 
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-
 ## Solution List
 solutions using C# for leetcode according to tags of questions
 Tags are following: