Submission #66158075

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Source Code Expand

#include <bits/stdc++.h>
#include <atcoder/modint>

namespace {
    using ModInt [[maybe_unused]] = atcoder::modint998244353;
    using Num [[maybe_unused]] = long long int;
    using Vec [[maybe_unused]] = std::vector<Num>;
    using Set [[maybe_unused]] = std::set<Num>;
    using Mset [[maybe_unused]] = std::multiset<Num>;
    using Edges [[maybe_unused]] = std::vector<std::vector<Num>>;

    template<typename T>
    using Q [[maybe_unused]] = std::queue<T>;

    template<typename T>
    using PQ [[maybe_unused]] = std::priority_queue<T, std::vector<T>, std::greater<T>>;

    const std::vector<std::pair<Num, Num>> dyxs {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
    std::map<char, std::pair<Num, Num>> directions {{'D', {1, 0}}, {'U', {-1, 0}}, {'R', {0, 1}}, {'L', {0, -1}}};

    template<typename T>
    void print_oneline(const std::vector<T>& vec, std::ostream& os) {
        const auto size = vec.size();
        for(size_t i{0}; i<size; ++i) {
            os << vec.at(i) << (((i+1) == size) ? '\n' : ' ');
        }
    }

    template<typename T>
    void print_each(const std::vector<T>& vec, std::ostream& os) {
        const auto size = vec.size();
        for(size_t i{0}; i<size; ++i) {
            os << vec.at(i) << '\n';
        }
    }
}

void solve(std::istream& is, std::ostream& os) {
    Num n {0};
    is >> n;

    if (n == 1) {
        os << "1\n";
        os << "1\n";
        return;
    }

    Vec ans;
    for(Num i{2}; i<=n; i+=2) {
        ans.push_back(i);
    }

    os << ans.size() << "\n";
    print_oneline(ans, os);



}

int main(void) {
    solve(std::cin, std::cout);
    return 0;
}

Submission Info

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