day 7

day6/render.cpp

@@ -184,26 +184,34 @@ void day6_render(const struct font * font,
     0xff'ff0000,
   };
 
+  if (day6_state.part == 2) {
+    if (day6_state.visited != NULL) {
+      for (int y = 0; y < day6_state.height; y++) {
+        for (int x = 0; x < day6_state.width; x++) {
+          int ix = y * day6_state.width + x;
+          unsigned char c = day6_state.visited[ix];
 
-  for (int y = 0; y < day6_state.height; y++) {
+          for (int i = 0; i < 4; i++) {
-    for (int x = 0; x < day6_state.width; x++) {
+            if (c & (1 << i)) {
-      int ix = y * day6_state.width + x;
+              arrow(x,
-      unsigned char c = day6_state.visited[ix];
+                    y,
-
+                    i,
-      for (int i = 0; i < 4; i++) {
+                    0xff'222222);
-        if (c & (1 << i)) {
+            }
-          arrow(x,
+          }
-                y,
-                i,
-                0xff'005555);
         }
       }
     }
+
+    arrow(day6_state.guard[1].position.x,
+          day6_state.guard[1].position.y,
+          day6_state.guard[1].facing,
+          base_color[1]);
   }
 
-  arrow(day6_state.guard[0]->position.x,
+  arrow(day6_state.guard[0].position.x,
-        day6_state.guard[0]->position.y,
+        day6_state.guard[0].position.y,
-        day6_state.guard[0]->facing,
+        day6_state.guard[0].facing,
         base_color[0]);
 
   // render text

day6/solution.c

@@ -118,8 +118,7 @@ void state_init(int part,
                 int stride,
                 int width,
                 int height,
-                unsigned char * visited,
+                unsigned char * visited)
-                struct guard * guard)
 {
   day6_state.part = part;
   day6_state.input = input;
@@ -127,7 +126,6 @@ void state_init(int part,
   day6_state.width = width;
   day6_state.height = height;
   day6_state.visited = visited;
-  day6_state.guard[0] = guard;
 }
 
 int64_t day6_part1(const char * input, int length)
@@ -143,14 +141,8 @@ int64_t day6_part1(const char * input, int length)
   guard.facing = UP;
   guard.position = find_guard(input, length, stride);
 
-  state_init(1, input, stride, width, height, visited, &guard);
+  state_init(1, input, stride, width, height, visited);
   while (true) {
-    /*
-    if (!day6_state.step)
-      continue;
-    day6_state.step = false;
-    */
-
     bool guard_inside_map = position_inside_map(width, height,
                                                 guard.position.x, guard.position.y);
     if (!guard_inside_map)
@@ -219,7 +211,7 @@ int64_t day6_part2(const char * input, int length)
   guard.facing = UP;
   guard.position = origin;
 
-  state_init(2, input, stride, width, height, visited, &guard);
+  state_init(2, input, stride, width, height, visited);
 
   unsigned char obstacles[height * width];
   for (int i = 0; i < width * height; i++) obstacles[i] = 0;

day6/solution.h

@@ -30,7 +30,7 @@ struct solution_state {
   int stride;
   int width;
   int height;
-  struct guard * guard[2];
+  struct guard guard[2];
   unsigned char * visited;
 };