Submission #1200482

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200482		The_Samurai	Village (BOI20_village)	C++20	50 / 100	53 ms	15004 KiB

Village

// I stand with PALESTINE



//#pragma GCC optimize("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("avx,avx2")

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
//using namespace __gnu_pbds;

#define int long long
#define ff first
#define ss second
#define sz(a) (int) (a).size()
//template<class T, class C = null_type> using ordered_tree = tree<T, C, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long double ld;

namespace io {

    template<typename F, typename S>
    ostream &operator<<(ostream &os, const pair<F, S> &p) { return os << p.ff << " " << p.ss; }

    template<typename F, typename S>
    ostream &operator<<(ostream &os, const map<F, S> &mp) {
        for (auto it: mp) { os << it << endl; }
        return os;
    }

    template<typename F>
    ostream &operator<<(ostream &os, const vector<F> &v) {
        bool space = false;
        for (F x: v) {
            if (space) os << " ";
            space = true;
            os << x;
        }
        return os;
    }

    template<typename F>
    ostream &operator<<(ostream &os, const deque<F> &d) {
        bool space = false;
        for (F x: d) {
            if (space) os << " ";
            space = true;
            os << x;
        }
        return os;
    }

    template<typename F>
    ostream &operator<<(ostream &os, const set<F> &st) {
        bool space = false;
        for (F x: st) {
            if (space) os << " ";
            space = true;
            os << x;
        }
        return os;
    }

    template<typename F>
    ostream &operator<<(ostream &os, const multiset<F> &st) {
        bool space = false;
        for (F x: st) {
            if (space) os << " ";
            space = true;
            os << x << x;
        }
        return os;
    }

    template<typename F, typename S>
    istream &operator>>(istream &is, pair<F, S> &p) { return is >> p.ff >> p.ss; }

    template<typename F>
    istream &operator>>(istream &is, vector<F> &v) {
        for (F &x: v) { is >> x; }
        return is;
    }

    long long fastread() {
        char c;
        long long d = 1, x = 0;
        do c = getchar(); while (c == ' ' || c == '\n');
        if (c == '-') c = getchar(), d = -1;
        while (isdigit(c)) {
            x = x * 10 + c - '0';
            c = getchar();
        }
        return d * x;
    }

    static bool sep = false;

    using std::to_string;

    string to_string(bool x) {
        return (x ? "true" : "false");
    }

    string to_string(const string &s) { return "\"" + s + "\""; }

    string to_string(const char *s) { return "\"" + string(s) + "\""; }

    string to_string(const char &c) {
        string s;
        s += c;
        return "\'" + s + "\'";
    }

    template<typename Type>
    string to_string(vector<Type>);

    template<typename F, typename S>
    string to_string(pair<F, S>);

    template<typename Collection>
    string to_string(Collection);

    template<typename F, typename S>
    string to_string(pair<F, S> p) { return "{" + to_string(p.ff) + ", " + to_string(p.ss) + "}"; }

    template<typename Type>
    string to_string(vector<Type> v) {
        bool sep = false;
        string s = "[";
        for (Type x: v) {
            if (sep) s += ", ";
            sep = true;
            s += to_string(x);
        }
        s += "]";
        return s;
    }

    template<typename Collection>
    string to_string(Collection collection) {
        bool sep = false;
        string s = "{";
        for (auto x: collection) {
            if (sep) s += ", ";
            sep = true;
            s += to_string(x);
        }
        s += "}";
        return s;
    }

    void print() {
        cout << endl;
        sep = false;
    }

    template<typename F, typename... Other>
    void print(F ff, Other... other) {
        if (sep) cout << " | ";
        sep = true;
        cout << to_string(ff);
        print(other...);
    }

}
using namespace io;

namespace utils {

    template<typename F, typename S>
    inline void maxs(F &a, S b) { a = a > b ? a : b; }

    template<typename F, typename S>
    inline void mins(F &a, S b) { a = a < b ? a : b; }

    template<typename F, typename S>
    long long max(F a, S b) { return a > b ? a : b; }

    template<typename F, typename S>
    long long min(F a, S b) { return a < b ? a : b; }

    constexpr long long operator "" _E(unsigned long long n) {
        long long p = 1, a = 10;
        for (int i = 0; i < n; i++) p *= a;
        return p;
    }

    random_device rd;
    mt19937 mt(rd());

    template<typename T>
    T rand(T l, T r) {
        uniform_int_distribution<T> dist(l, r);
        return dist(mt);
    };

}
using namespace utils;


#ifdef sunnatov
#define print(...) cout << "[" << #__VA_ARGS__ << "]: "; io::print( __VA_ARGS__ );
#else
#define print( ... ) 42
#endif

const int mod = 9_E + 7;
const double EPS = 1e-7;
long long doxuya = 18_E + 10;
int INF = 9_E + 10;
const char nl = '\n';

int month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

/*

*/

pair<int, vector<int>> solve_min(int n, vector<vector<int>> &g) {
    vector<int> ans(n + 1), fr(n + 1, -1), par(n + 1), height(n + 1), ord(n + 1);
    auto dfs = [&](auto &dfs, int u) -> void {
        for (int v: g[u]) {
            if (par[u] == v) continue;
            par[v] = u;
            height[v] = height[u] + 1;
            dfs(dfs, v);
        }
    };
    dfs(dfs, 1);
    iota(ord.begin(), ord.end(), 0);
    sort(ord.begin(), ord.end(), [&](int u, int v) -> bool {
        return height[u] > height[v];
    });
    fr[0] = 0;
    int sum = 2 * n;
    for (int u: ord) {
        if (fr[par[u]] != -1 or fr[u] != -1) continue;
        fr[u] = par[u]; fr[par[u]] = u;
        sum -= 2;
    }
    vector<bool> done(n + 1);
    for (int u: ord) {
        if (fr[u] == -1 or height[u] > height[fr[u]]) continue;
        vector<int> vec;
        vec.emplace_back(u);
        vec.emplace_back(fr[u]);
        for (int v: g[u]) {
            if (done[v] or fr[v] != -1) continue;
            vec.emplace_back(v);
        }
        for (int i = 0; i < sz(vec); i++) ans[vec[i]] = vec[(i + 1) % sz(vec)];
        for (int x: vec) done[x] = true;
    }
    return make_pair(sum, ans);
}

void solution(istream &cin, ostream &cout, const int &test_case) {
    int n;
    cin >> n;
    vector<vector<int>> g(n + 1);
    for (int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        g[u].emplace_back(v);
        g[v].emplace_back(u);
    }
    auto [sum, min_ans] = solve_min(n, g);
    cout << sum << ' ' << 0 << nl;
    for (int i = 1; i <= n; i++) cout << min_ans[i] << ' ';
    cout << nl;
    cout << vector(n, 1);
}

int32_t main() {
    clock_t startTime = clock();
    cin.tie(0)->sync_with_stdio(false);
    srand(time(0));

    std::istream &in(std::cin);
    std::ostream &out(std::cout);

    int32_t queries = 1;

#ifdef test_cases
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    cin >> queries;
#else
    // cin >> queries;
#endif

    for (int32_t test_case = 1; test_case <= queries; test_case++) {
        print(test_case);
        solution(cin, cout, test_case);
        cout << nl;
    }

#ifdef sunnatov
    cout << "Time: " << (int) ((double) (clock() - startTime) / CLOCKS_PER_SEC * 1000) << " ms" << endl;
#endif

    return EXIT_SUCCESS;
}

• Subtask 1: 6 / 12
• Subtask 2: 19 / 38
• Subtask 3: 25 / 50