1 files changed, 3 insertions, 7 deletions

diff --git a/2023/08/8a.c b/2023/08/8a.c
index 62f6fcd..f6d58b5 100644
--- a/2023/08/8a.c
+++ b/2023/08/8a.c
@@ -1,17 +1,13 @@
-#include <inttypes.h>
-#include <math.h>
-#include <stdbool.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 
 #define N 30000
-
-bool isnum(char c) { return c >= '0' && c <= '9'; }
-int index(char *c) { return c[0]-'A' + (c[1]-'A' + (c[2]-'A')*26)*26; }
+#define ISNUM(c) (c >= '0' && c <= '9')
 
 int map[N][2];
 
+int index(char *c) { return c[0]-'A' + (c[1]-'A' + (c[2]-'A')*26)*26; }
+
 int main() {
         char *buf, dir[N], line[N];
         int n, i, s;