1 files changed, 37 insertions, 19 deletions

diff --git a/src/2022/day19/aoc.cpp b/src/2022/day19/aoc.cpp
index 85e0767..f5ea6a1 100644
--- a/src/2022/day19/aoc.cpp
+++ b/src/2022/day19/aoc.cpp
@@ -5,10 +5,12 @@ namespace aoc2022 {
 struct build_result {
   int products[4] = {0, 0, 0, 0}; // ore,clay,obsi,geod
   int robots[4] = {1, 0, 0, 0};   // ore,clay,obsi,geod
+  friend bool operator<(build_result r1, build_result r2) { return r1.products[3] < r2.products[3]; }
 };
 
 void print_result(int i, int m, const build_result& r) {
-  printf("%d %02d| ore[%d] clay[%d] obsi[%d] geod[%d]\n", i, m, r.products[0], r.products[1], r.products[2], r.products[3]);
+  printf("%d %02d| ore[%d] clay[%d] obsi[%d] geod[%d]\n", i, m, r.products[0], r.products[1], r.products[2],
+         r.products[3]);
   printf("%d %02d| robots: %d %d %d %d\n", i, m, r.robots[0], r.robots[1], r.robots[2], r.robots[3]);
 }
 
@@ -28,7 +30,7 @@ bool can_build(int i, const build_result& r, const blueprint& b) {
   return false;
 }
 
-void build_robot(int i, build_result& r, const blueprint& b) {
+build_result build_robot(int i, build_result r, const blueprint& b) {
   switch (i) {
   case 0:
     r.products[0] -= b.c_ore_r;
@@ -51,11 +53,36 @@ void build_robot(int i, build_result& r, const blueprint& b) {
   default:
     break;
   }
+  return r;
 }
 
-void build_product(build_result& r, bool bs[4]) {
+void build_product(build_result& r, int x) {
   for (int i = 0; i < 4; i++) {
-    r.products[i] += r.robots[i] - (int) bs[i];
+    r.products[i] += r.robots[i] - ((int)i == x);
+  }
+}
+
+int to_build(const blueprint& b, const build_result& r) {
+  int i = 3;
+  return i;
+}
+
+void build(int m, const blueprint& b, build_result r, build_result& max) {
+  if (m > 0) {
+    // print_result(b.idx, 24 - m, r);
+    int i = to_build(b, r);
+    if (i != INT32_MAX) {
+      auto r0 = build_robot(i, r, b);
+      build_product(r0, i);
+      build(m - 1, b, r0, max);
+    } else {
+      build_product(r, 5);
+      build(m - 1, b, r, max);
+    }
+  } else {
+    if (max < r) {
+      max = r;
+    }
   }
 }
 
@@ -67,22 +94,13 @@ std::pair<int, int> day19(line_view file) {
   });
 
   std::vector<build_result> rs;
-  for (size_t i = 0; i < bs.size(); i++) {
+  for (auto& b : bs) {
     build_result r;
-    int n = 24;
-    bs[i].print();
-    while (n-- > 0) {
-      bool bss[4] = {false, false, false, false};
-      for (int j = 3; j >= 0; j--) {
-        if (can_build(j, r, bs[i])) {
-          bss[j] = true;
-          build_robot(j, r, bs[i]);
-        }
-      }
-      build_product(r, bss);
-      print_result(bs[i].idx, 24 - n, r);
-    }
-    rs.push_back(r);
+    build_result m;
+    // b.print();
+    build(24, b, r, m);
+    print_result(b.idx, 24, m);
+    rs.push_back(m);
   }
 
   return {0, 0};