#include "topio.h"
-#include <ctype.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
#include <cassert>
+#include <cctype>
+#include <cerrno>
#include <cmath>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
#include <algorithm>