advent2025

commit b609d1484f17b56f2fb95e74019e25be48948f9c
parent 3637ea9d48f67da86ae03baa0f31aa9ae6e54781
Author: bsandro <email@bsandro.tech>
Date:   Thu, 11 Dec 2025 07:27:44 +0200

day10 p2 lost interest

Diffstat:
M
day10.c
 | 
21
+++++++++++++++------

1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/day10.c b/day10.c
@@ -6,6 +6,12 @@
 
 #define BUF_SIZE 256
 
+int btoi(int bufl, int buf[bufl]) {
+    int num = 0;
+    for (int i=0;i<bufl;++i) num = num*10+buf[i];
+    return num;
+}
+
 typedef struct {
     int toggles_l;
     int toggles[16];
@@ -17,7 +23,8 @@ typedef struct {
     bool lights1[16];//overall value that we can change
     int buttons_l;
     Button buttons[16];
-    int presses;
+    int joltajes_l;
+    int joltages[16]; // same number as lights
 } Machine;
 
 void m_lights_add(Machine *m, int buf_l, char buf[buf_l]) {
@@ -40,13 +47,14 @@ bool m_lights_on(Machine *m) {
     return true;
 }
 
+//@todo use XOR
 void m_light_toggle(Machine *m, int light) {
     m->lights1[light] = !m->lights1[light];
 }
 
 void m_print(Machine *m) {
     printf("(%zu) Lights:  [", sizeof(Machine));
-    for (int i=0;i<m->lights_l;++i) printf("%c", m->lights1[i]?'#':'.');
+    for (int i=0;i<m->lights_l;++i) printf("%c", m->lights[i]?'#':'.');
     printf("]\n");
 }
 
@@ -55,7 +63,6 @@ void m_btn_press(Machine *m, int b) {
     for (int i=0;i<btn->toggles_l;++i) {
         m_light_toggle(m, btn->toggles[i]);
     }
-    m->presses++;
 }
 
 void m_btn_press_many(Machine *m, int comb_l, int comb[comb_l]) {
@@ -75,7 +82,7 @@ bool try_combination(Machine *m, int comb_l, int comb[comb_l], int p) {
         //puts("after:");
         //m_print(&m1);
         if (m_lights_on(&m1)) {
-            puts("ok");
+            //puts("ok");
             return true;
         }
         //return m_lights_on(&m1);
@@ -123,9 +130,9 @@ int main(void) {
         printf("%d buttons\n", machines[i].buttons_l);
         m_print(&machines[i]);
         for (int j=1;j<=20;++j) {
-            printf("try start %i with %d button presses\n", i, j);
+            //printf("try start %i with %d button presses\n", i, j);
             if (m_try_start(machines[i], j)) {
-                printf("%d presses start ok\n", j);
+                //printf("%d presses start ok\n", j);
                 part1 += j;
                 break;
             }
@@ -134,3 +141,5 @@ int main(void) {
     printf("p1: %"PRIi64"\np2: %"PRIi64"\n", part1, part2);
     return 0;
 }
+
+// part 2 answer: 20002