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#include "alg/monoid/assign.hpp"
#pragma once template <typename X, int none_val> struct Monoid_Assign { using value_type = X; static X op(X x, X y) { return (y == X(none_val) ? x : y); } static constexpr X unit() { return X(none_val); } static constexpr bool commute = false; };
#line 2 "alg/monoid/assign.hpp" template <typename X, int none_val> struct Monoid_Assign { using value_type = X; static X op(X x, X y) { return (y == X(none_val) ? x : y); } static constexpr X unit() { return X(none_val); } static constexpr bool commute = false; };