__lg

yosupo06 · Mar 19, 2024 · bef6719 · bef6719
1 parent 9e353eb
commit bef6719
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/math/composition_of_formal_power_series_large/sol/correct.cpp b/math/composition_of_formal_power_series_large/sol/correct.cpp
@@ -424,7 +424,7 @@ vc<mint> middle_product(vc<mint> &a, vc<mint> &b) {
   if (min(len(b), len(a) - len(b) + 1) <= 60) {
     return middle_product_naive(a, b);
   }
-  int n = 1 << __lg(2 * len(a) - 1);
+  int n = 1 << topbit(2 * len(a) - 1);
   vc<mint> fa(n), fb(n);
   copy(a.begin(), a.end(), fa.begin());
   copy(b.rbegin(), b.rend(), fb.begin());