library/algebra/monoid/MaxIndex.hpp

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Last update: 2025-11-24 18:49:07+09:00
Include: #include "library/algebra/monoid/MaxIndex.hpp"

Depends on

build/pch/stdc++.hpp

Code

#pragma once
template <typename X> struct MonoidMaxIndex {
    using P = std::pair<X, int>;
    using value_type = P;
    static constexpr P op(const P &x, const P &y) noexcept {
        returnstd::max(x, y);
    }
    static constexpr void Rchop(P &x, const P &y) {
        if (x < y)
            x = y;
    }
    static constexpr void Lchop(const P &x, P &y) {
        if (y < x)
            y = x;
    }
    static constexpr P unit() {
        return P(std::numeric_limits<X>::min() / 2, -1);
    }
    static constexpr bool commute = true;
    static constexpr std::vector<P> arrange(const std::vector<X> &v) {
        std::vector<P> w(v.size());
        for (int i = 0; i < v.size(); i++)
            w[i] = P(v[i], i);
        return w;
    }
};

#line 2 "library/algebra/monoid/MaxIndex.hpp"
template <typename X> struct MonoidMaxIndex {
    using P = std::pair<X, int>;
    using value_type = P;
    static constexpr P op(const P &x, const P &y) noexcept {
        returnstd::max(x, y);
    }
    static constexpr void Rchop(P &x, const P &y) {
        if (x < y)
            x = y;
    }
    static constexpr void Lchop(const P &x, P &y) {
        if (y < x)
            y = x;
    }
    static constexpr P unit() {
        return P(std::numeric_limits<X>::min() / 2, -1);
    }
    static constexpr bool commute = true;
    static constexpr std::vector<P> arrange(const std::vector<X> &v) {
        std::vector<P> w(v.size());
        for (int i = 0; i < v.size(); i++)
            w[i] = P(v[i], i);
        return w;
    }
};