isolate effect

1 files changed, 5 insertions, 4 deletions

diff --git a/src/2022/day16/aoc.cpp b/src/2022/day16/aoc.cpp
index 17fd268..870ab9e 100644
--- a/src/2022/day16/aoc.cpp
+++ b/src/2022/day16/aoc.cpp
@@ -32,7 +32,7 @@ std::pair<int, size_t> get_opened(std::set<valve*>& opened) {
 //   return space;
 // }
 
-void flow(int minute, valve* v, std::set<valve*>& opened, int total, int* maxtotal) {
+void flow(int minute, valve* v, std::set<valve*> opened, int total, int* maxtotal) {
   auto p = get_opened(opened);
   total += p.first;
   // std::cout << indent(minute) << v->name;
@@ -47,7 +47,9 @@ void flow(int minute, valve* v, std::set<valve*>& opened, int total, int* maxtot
     } else {
       if (v->rate == 0 || v->open) {
         for (auto& o : v->others) {
-          flow(minute + 1, get(o), opened, total, maxtotal);
+          if (get(o)->rate == 0 || !get(o)->open) {
+            flow(minute + 1, get(o), opened, total, maxtotal);
+          }
         }
       } else { // v-rate > 0 && v->open == false
         auto others = v->others;
@@ -59,8 +61,7 @@ void flow(int minute, valve* v, std::set<valve*>& opened, int total, int* maxtot
             flow(minute + 2, get(o), opened, total, maxtotal);
           }
           else {
-            auto os = opened;
-            flow(minute + 1, get(o), os, total, maxtotal);
+            flow(minute + 1, get(o), opened, total, maxtotal);
           }
         }
       }