advent2025

commit 16ae6cebdf9f4dd2086138d5db0381dccd67c6ce
parent 37fe582c54b04e8e8cd7a2967b8887039d3ab047
Author: bsandro <email@bsandro.tech>
Date:   Mon,  1 Dec 2025 22:53:53 +0200

day01 cleanup

Diffstat:
M
day01.c
 | 
26
++++++++++++++------------

1 file changed, 14 insertions(+), 12 deletions(-)
diff --git a/day01.c b/day01.c
@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include "cputime.h"
 
+#define DIAL 100
+
 int main(void) {
     int cur = 50;
     int p1 = 0;
@@ -10,30 +12,30 @@ int main(void) {
     int bufs = 0;
     int cnt = 0;
     for (char c=getchar();c!=EOF;c=getchar()) {
-        // sscanf() was here but it felt slow
         if (c=='L'||c=='R') {
             dir = c;
             cnt = 0;
         } else if (c>='0'&&c<='9') {
             buf[bufs++] = c-'0';
-        } else if (c=='\n') {
+        } else if (c=='\n') { // sscanf() felt slow
             for (int i=0;i<bufs;++i) {
-                cnt = cnt*10+buf[i];
+                cnt = cnt*10+buf[i]; // reinventing atoi
+            }
+            if (cnt>=DIAL) {
+                p2 += cnt/DIAL;
+                cnt = cnt%DIAL;
             }
-            if (cnt>99) p2+=cnt/100;
-            cnt = cnt%100;
             if (dir=='L') {
                 if (cur&&cnt>cur) p2++;
-                cur-=cnt;
-                if (cur<0) cur=100+cur;
+                cur -= cnt;
+                if (cur<0) cur=DIAL+cur;
             } else if (dir=='R') {
-                if (cur+cnt>100) p2++;
-                cur+=cnt;
-                if (cur>99) cur=cur-100;
+                if (cur+cnt>DIAL) p2++;
+                cur += cnt;
+                if (cur>=DIAL) cur = cur-DIAL;
             }
             if (cur==0) { p1++; p2++; }
-            cnt=0;
-            bufs=0;
+            bufs = cnt = 0;
         }
     }
     printf("p1: %d\np2: %d\n", p1, p2);