171. Excel Sheet Column Number (java)

Author: bluesword12350

solution/0171.Excel Sheet Column Number/Solution.java

@@ -0,0 +1,12 @@
+class Solution {
+    public int titleToNumber(String s) {
+        char[] cs = s.toCharArray();
+        int n = 0;
+        int p = 1;
+        for (int i = cs.length-1; i >= 0; i--) {
+            n += (cs[i]-'A'+1)*p;
+            p *= 26;
+        }
+        return n;
+    }
+}