diff --git a/HDOJ/1251.cpp b/HDOJ/1251.cpp
new file mode 100644
index 0000000..fa7465b
--- /dev/null
+++ b/HDOJ/1251.cpp
@@ -0,0 +1,55 @@
+/// HDU 1251
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+using namespace std;
+
+struct node
+{
+    node* next[26];
+    int val;
+    node(){val=0;memset(next,0,sizeof(next));}
+};
+char buffer[1024];
+node _root;
+node* root=&_root;
+int main()
+{
+    while(gets(buffer))
+    {
+        if(strlen(buffer)<1)
+        {
+            break;
+        }
+        char* p=buffer;
+        node* np=root;
+        while(*p!=0)
+        {
+            if(np->next[*p-'a']==NULL) np->next[*p-'a']=new node;
+            np=np->next[*p-'a'];
+            p++;
+            np->val++;
+        }
+    }
+    while(gets(buffer))
+    {
+        char* p=buffer;
+        node* np=root;
+        bool undone=true;
+        while(*p!=0)
+        {
+            if(np->next[*p-'a']==NULL)
+            {
+                printf("0\n");undone=false;break;
+            }
+            np=np->next[*p-'a'];
+            p++;
+        }
+        if(undone)
+        {
+            printf("%d\n",np->val);
+        }
+    }
+    return 0;
+}
+