JavaCourse00
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@@ -0,0 +1,18 @@
+package leetcode;
+
+public class ListNode {
+    int val;
+    ListNode next;
+
+    ListNode() {
+    }
+
+    ListNode(int val) {
+        this.val = val;
+    }
+
+    ListNode(int val, ListNode next) {
+        this.val = val;
+        this.next = next;
+    }
+}
@@ -0,0 +1,42 @@
+package leetcode;
+
+public class Solution {
+    public static void main(String[] args) {
+        ListNode head = new ListNode(4);
+        head.next = new ListNode(2);
+        head.next.next = new ListNode(1);
+        head.next.next.next = new ListNode(3);
+        new Solution().numDecodings("12");
+    }
+
+    public int numDecodings(String s) {
+        if (s.charAt(0) == '0') return 0;
+
+        int[] dp = new int[s.length() + 1];
+        dp[0] = 1;
+        dp[1] = 1;
+
+        if (s.length()==1) return dp[1];
+
+        for (int i=2; i<s.length(); i++) {
+            char c1 = s.charAt(i-1);
+            char c2 = s.charAt(i-2);
+
+            if (c1 == '0' && c2 == '0') return 0;
+            if (c1 == '0' && c2 > '2') return 0;
+
+            if (c1 == '0' || c2 == '0') {
+                dp[i] = c1=='0'? dp[i-2] : dp[i-1];
+            } else {
+                if (c2 <= '2' && c1 <= '6') {
+                    dp[i] = dp[i-2] + dp[i-1];
+                } else {
+                    dp[i] = dp[i-1];
+                }
+            }
+
+        }
+        return dp[s.length()];
+    }
+
+}