Puzzle 19: Don't build ore/clay robots when short on time

Don't try building ore robots if there are fewer than 10 rounds
remaining, or clays robots if there are fewer than 5. It's probably too
late for those robots to make a difference? Maybe?

(Why 5 and 10 rounds? Just a guess. And it seems to still get the right
result)

Drops time by 90% on 22-round test data (4.8s -> 0.4s)

1 files changed, 2 insertions, 0 deletions

diff --git a/19.c b/19.c
index a534090..61ac737 100644
--- a/19.c
+++ b/19.c
@@ -260,6 +260,7 @@ inventory_build_exhaustive(struct inventory * i, struct blueprint const * b, int
 
 	// Try building a clay robot, and checking if that's better than anything else
 	if (i->clay.robots < b->max_clay
+			&& remaining > 5
 			&& inventory_build(&test, b, CLAY) == 0)
 	{
 //		fprintf(stderr, "%d: building a clay robot (%ld)\n", remaining, test.clay.amount);
@@ -272,6 +273,7 @@ inventory_build_exhaustive(struct inventory * i, struct blueprint const * b, int
 
 	// Try building a ore robot, and checking if that's better than anything else
 	if (i->ore.robots < b->max_ore
+			&& remaining > 10
 			&& inventory_build(&test, b, ORE) == 0)
 	{
 //		fprintf(stderr, "%d: building a ore robot (%ld)\n", remaining, test.ore.amount);