change cstdio to stdio.h

server.cc

@@ -1,7 +1,7 @@
-#include <cstdio>
 #include <curses.h>
 #include <netinet/in.h>
 #include <pthread.h>
+#include <stdio.h>
 #include <string.h>
 #include <sys/socket.h>
 #include <sys/time.h>