Added header for std::function

tturocy · tturocy · commit 44ed576c3b1b · 2025-12-02T10:00:11.000Z
diff --git a/src/games/gametree.cc b/src/games/gametree.cc
@@ -22,6 +22,7 @@
 
 #include <iostream>
 #include <algorithm>
+#include <functional>
 #include <numeric>
 #include <stack>
 #include <set>
