This is the second time I met this problem.

HDOJ/2089_X.cpp

@@ -0,0 +1,43 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <queue>
+#include <algorithm>
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+/// This Contest and Compile does not support C++11.
+//#include <thread>
+//#include <mutex>
+//#include <condition_variable>
+//#include <functional>
+
+using namespace std;
+
+bool ck[1000100];
+char buff[16];
+
+int main()
+{
+    for(int i=0;i<1000001;i++)
+    {
+        sprintf(buff,"%d",i);
+        ck[i]=(strstr(buff,"4")!=NULL||strstr(buff,"62")!=NULL);
+    }
+
+    int n,m;
+    while(1)
+    {
+        scanf("%d %d",&n,&m);
+        if(!n&&!m) break;
+        int cc=0;
+        for(int i=n;i<=m;i++)
+        {
+            cc+=(int)!ck[i];
+        }
+        printf("%d\n",cc);
+    }
+    return 0;
+}