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#include "alg/monoid/min2.hpp"
#pragma once template <typename T, typename KEY> struct Monoid_Min2 { struct Data { T min1, min2; KEY key1, key2; bool add_element(T x, KEY key) { if (key1 == key) { return chmin(min1, x); } if (key2 == key) { bool upd = chmin(min2, x); if (min1 > min2) swap(min1, min2), swap(key1, key2); return upd; } if (min1 > x) { min2 = min1, key2 = key1, min1 = x, key1 = key; return 1; } elif (min2 > x) { min2 = x, key2 = key; return 1; } return 0; } }; using value_type = Data; using X = value_type; static X op(X x, X y) { x.add_element(y.min1, y.key1); x.add_element(y.min2, y.key2); return x; } static constexpr X unit() { return {infty<T>, infty<T>, -1, -1}; } static constexpr bool commute = true; };
#line 2 "alg/monoid/min2.hpp" template <typename T, typename KEY> struct Monoid_Min2 { struct Data { T min1, min2; KEY key1, key2; bool add_element(T x, KEY key) { if (key1 == key) { return chmin(min1, x); } if (key2 == key) { bool upd = chmin(min2, x); if (min1 > min2) swap(min1, min2), swap(key1, key2); return upd; } if (min1 > x) { min2 = min1, key2 = key1, min1 = x, key1 = key; return 1; } elif (min2 > x) { min2 = x, key2 = key; return 1; } return 0; } }; using value_type = Data; using X = value_type; static X op(X x, X y) { x.add_element(y.min1, y.key1); x.add_element(y.min2, y.key2); return x; } static constexpr X unit() { return {infty<T>, infty<T>, -1, -1}; } static constexpr bool commute = true; };