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Prune by symmetry: constrain 1st adj row to all 1s at low end.
[matchsticks-search.git]
/
main.c
diff --git
a/main.c
b/main.c
index 83728fa7a4aee7cb0168bbdc96d2bd689483669d..6f0df725949c9b26fccb613768f74c283bc9e591 100644
(file)
--- a/
main.c
+++ b/
main.c
@@
-329,6
+329,8
@@
static void iterate_recurse(int i, AdjWord min) {
adjmatrix[i]++) {
if (count_set_adj_bits(adjmatrix[i]) > maxhamweight)
goto again;
+ if (i == 0 && (adjmatrix[i] & (1+adjmatrix[i])))
+ goto again;
iterate_recurse(i+1, adjmatrix[i]);