Fixes

Author: adamant-pwn

cp-algo/math/poly.hpp

@@ -71,8 +71,8 @@ namespace cp_algo::math {
 
         poly_t& reverse(size_t n) {return poly::impl::reverse(*this, n);}
         poly_t& reverse() {return reverse(size(a));}
-        poly_t reversed(size_t n) {return poly_t(*this).reverse(n);}
-        poly_t reversed() {return poly_t(*this).reverse();}
+        poly_t reversed(size_t n) const {return poly_t(*this).reverse(n);}
+        poly_t reversed() const {return poly_t(*this).reverse();}
 
         std::array<poly_t, 2> divmod(poly_t const& b) const {
             return poly::impl::divmod(*this, b);

cp-algo/math/poly/impl/div.hpp

@@ -31,7 +31,7 @@ namespace cp_algo::math::poly::impl {
         }
         poly D;
         if(d >= 0) {
-            D = (p.reverse().mod_xk(d + 1) * qri.mod_xk(d + 1)).mod_xk(d + 1).reverse(d + 1);
+            D = (p.reversed().mod_xk(d + 1) * qri.mod_xk(d + 1)).mod_xk(d + 1).reversed(d + 1);
         }
         return std::array{D, p - D * q};
     }
@@ -41,7 +41,7 @@ namespace cp_algo::math::poly::impl {
         if(std::min(d, q.deg()) < magic) {
             return divmod_slow(p, q);
         }
-        return divmod_hint(p, q, q.reverse().inv(d + 1));
+        return divmod_hint(p, q, q.reversed().inv(d + 1));
     }
 
     template<typename poly>