From 8cd982815b135dd3969227d0393e96daf178871e Mon Sep 17 00:00:00 2001
From: sourcema <mazheinchina@gmail.com>
Date: Thu, 28 Mar 2019 21:42:16 +0800
Subject: [PATCH] Create sourcema.md

---
 2019.02.09-leetcode91/sourcema.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 2019.02.09-leetcode91/sourcema.md

diff --git a/2019.02.09-leetcode91/sourcema.md b/2019.02.09-leetcode91/sourcema.md
new file mode 100644
index 000000000..15305a2f7
--- /dev/null
+++ b/2019.02.09-leetcode91/sourcema.md
@@ -0,0 +1,26 @@
+# LeetCode 91
+    class Solution {
+    public int numDecodings(String s) {
+        if (s.length() == 0||s.charAt(0)=='0') {
+            return 0;
+        }
+        return find(s,0);
+    }
+    private  int find(String s,int index) {
+        if (index == s.length()) {
+            return 1;
+        }
+        if (s.charAt(index) == '0') {
+            return 0;
+        }
+        int res=0;
+        res += find(s, index + 1);
+      if (index + 1 < s.length() && s.charAt(index) == '1') {
+            res += find(s,index+ 2);
+        }
+        if (index + 1 < s.length() && (s.charAt(index) == '2')&&s.charAt(index+1)<='6') {
+            res += find(s,index + 2);
+        }
+        return res;
+    }
+}