add excel sheet column number

Author: tg123

excel-sheet-column-number/README.md

@@ -0,0 +1,18 @@
+public class Solution {
+    public int titleToNumber(String s) {
+        char[] S = s.toCharArray();
+        
+        int n = 0;
+        
+        int p = 1;
+        
+        for(int i = S.length - 1; i >= 0; i--){
+            
+            n += (S[i] - 'A' + 1) * p;
+            
+            p *= 26;    
+        }
+        
+        return n;
+    }
+}

excel-sheet-column-number/Solution.java

@@ -0,0 +1,8 @@
+---
+layout: solution
+title: Excel Sheet Column Number
+date: 2014-12-28 23:03:17+08:00
+---
+{% assign leetcode_name = {{page.path | remove: '/index.md'}}  %}
+{% assign leetcode_readme = {{leetcode_name | append: '/README.md' | prepend: '_root/' }}  %}
+{% include {{leetcode_readme}} %}