oj.uz

Submission #1093614

# Submission time Handle Problem Language Result Execution time Memory
1093614 2024-09-27T06:48:34 Z CDuong Inside information (BOI21_servers) C++17
80 / 100
 259 ms 28468 KB 
/*
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,fma,bmi,bmi2,sse4.2,popcnt,lzcnt")
*/

#include <bits/stdc++.h>
#define taskname ""
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define i64 long long
#define isz(x) (int)x.size()
using namespace std;

template<bool ALLOW_NON_PREFIX_QUERY, class T, class F, class I>
struct fenwick_tree{
    int n;
    vector<T> data;
    F TT;
    T T_id;
    I Tinv;
    fenwick_tree(F TT, T T_id, I Tinv): TT(TT), T_id(T_id), Tinv(Tinv){ }
    fenwick_tree &operator=(const fenwick_tree &fw){
        n = fw.n;
        data = fw.data;
    }
    // O(n)
    void build(int n){
        assert(n >= 0);
        this->n = n;
        data.assign(n, T_id);
    }
    // O(n)
    void build(int n, T x){
        assert(n >= 0);
        this->n = n;
        data.assign(n, x);
        for(auto i = 1; i <= n; ++ i) if(i + (i & -i) <= n) data[i + (i & -i) - 1] = TT(data[i + (i & -i) - 1], data[i - 1]);
    }
    // O(n)
    template<class U>
    void build(const vector<U> &a){
        n = (int)a.size();
        data.resize(n);
        copy(a.begin(), a.end(), data.begin());
        for(auto i = 1; i <= n; ++ i) if(i + (i & -i) <= n) data[i + (i & -i) - 1] = TT(data[i + (i & -i) - 1], data[i - 1]);
    }
    // O(log(n))
    void update(int p, T x){
        assert(0 <= p && p < n);
        for(++ p; p <= n; p += p & -p) data[p - 1] = TT(data[p - 1], x);
    }
    // O(log(n))
    void set(int p, T x){
        update(p, TT(x, Tinv(query(p))));
    }
    // O(log(n))
    T prefix(int r) const{
        assert(0 <= r && r <= n);
        T s = T_id;
        for(; r > 0; r -= r & -r) s = TT(s, data[r - 1]);
        return s;
    }
    // O(log(n))
    T query(int l, int r) const{
        static_assert(ALLOW_NON_PREFIX_QUERY);
        assert(0 <= l && l <= r && r <= n);
        if(l == r) return T_id;
        T sum_minus = T_id, sum_plus = T_id;
        for(; l < r; r -= r & -r) sum_plus = TT(sum_plus, data[r - 1]);
        for(; r < l; l -= l & -l) sum_minus = TT(sum_minus, data[l - 1]);
        return TT(sum_plus, Tinv(sum_minus));
    }
    // O(log(n))
    T query(int p) const{
        static_assert(ALLOW_NON_PREFIX_QUERY);
        return query(p, p + 1);
    }
    // O(log(n))
    T query_all() const{
        return prefix(n);
    }
    // pred(sum[0, r)) is T, T, ..., T, F, F, ..., F, returns max r with T
    // O(log(n))
    int max_pref(auto pred) const{
        assert(pred(T_id));
        int p = 0;
        T sum = T_id;
        for(auto i = __lg(n + 1); i >= 0; -- i) if(p + (1 << i) <= n && pred(TT(sum, data[p + (1 << i) - 1]))){
            sum = TT(sum, data[p + (1 << i) - 1]);
            p += 1 << i;
        }
        return p;
    }
    template<class output_stream>
    friend output_stream &operator<<(output_stream &out, const fenwick_tree &fw){
        out << "{";
        for(auto i = 0; i < fw.n; ++ i){
            out << fw.query(i);
            if(i != fw.n - 1) out << ", ";
        }
        return out << '}';
    }
};

template<class T, class F, class I>
auto make_fenwick_tree(F TT, T T_id, I Tinv){
    return fenwick_tree<true, T, F, I>(TT, T_id, Tinv);
}
template<class T>
auto make_fenwick_tree_sum(){
    return fenwick_tree<true, T, plus<>, negate<>>(plus<>(), T{0}, negate<>());
}
template<class T>
auto make_fenwick_tree_product(){
    auto inverse = [](const T &x){ return 1 / x; };
    return fenwick_tree<true, T, multiplies<>, decltype(inverse)>(multiplies<>(), T{1}, inverse);
}
template<class T>
auto make_fenwick_tree_min(){
    auto TT = [&](const T &x, const T &y)->T{ return min(x, y); };
    return fenwick_tree<false, T, decltype(TT), negate<>>(TT, numeric_limits<T>::max(), negate<>());
}
template<class T>
auto make_fenwick_tree_max(){
    auto TT = [&](const T &x, const T &y)->T{ return max(x, y); };
    return fenwick_tree<false, T, decltype(TT), negate<>>(TT, numeric_limits<T>::max(), negate<>());
}

template<class T>
struct graph{
    using Weight_t = T;
    struct Edge_t{
        int from, to;
        T cost;
    };
    int n;
    vector<Edge_t> edge;
    vector<vector<int>> adj;
    function<bool(int)> ignore;
    graph(int n = 1): n(n), adj(n){
        assert(n >= 1);
    }
    graph(const vector<vector<int>> &adj, bool undirected = true): n((int)adj.size()), adj(n){
        assert(n >= 1);
        if(undirected){
            for(auto u = 0; u < n; ++ u) for(auto v: adj[u]) if(u < v) link(u, v);
        }
        else for(auto u = 0; u < n; ++ u) for(auto v: adj[u]) orient(u, v);
    }
    graph(const vector<vector<pair<int, T>>> &adj, bool undirected = true): n((int)adj.size()), adj(n){
        assert(n >= 1);
        if(undirected){
            for(auto u = 0; u < n; ++ u) for(auto [v, w]: adj[u]) if(u < v) link(u, v, w);
        }
        else for(auto u = 0; u < n; ++ u) for(auto [v, w]: adj[u]) orient(u, v, w);
    }
    graph(int n, vector<array<int, 2>> &edge, bool undirected = true): n(n), adj(n){
        assert(n >= 1);
        for(auto [u, v]: edge) undirected ? link(u, v) : orient(u, v);
    }
    graph(int n, vector<tuple<int, int, T>> &edge, bool undirected = true): n(n), adj(n){
        assert(n >= 1);
        for(auto [u, v, w]: edge) undirected ? link(u, v, w) : orient(u, v, w);
    }
    int add_vertex(){
        adj.emplace_back();
        return n ++;
    }
    int operator()(int u, int id) const{
        #ifdef LOCAL
        assert(0 <= id && id < (int)edge.size());
        assert(edge[id].from == u || edge[id].to == u);
        #endif
        return u ^ edge[id].from ^ edge[id].to;
    }
    int link(int u, int v, T w = {}){ // insert an undirected edge
        int id = (int)edge.size();
        adj[u].push_back(id), adj[v].push_back(id), edge.push_back({u, v, w});
        return id;
    }
    int orient(int u, int v, T w = {}){ // insert a directed edge
        int id = (int)edge.size();
        adj[u].push_back(id), edge.push_back({u, v, w});
        return id;
    }
    vector<int> neighbor(int u, int exclude = -1) const{
        vector<int> res;
        for(auto id: adj[u]){
            if(id == exclude || ignore && ignore(id)) continue;
            res.push_back(operator()(u, id));
        }
        return res;
    }
    void clear(){
        for(auto [u, v, w]: edge){
            adj[u].clear();
            adj[v].clear();
        }
        edge.clear();
        ignore = {};
    }
    graph transpose() const{ // the transpose of the directed graph
        graph res(n);
        for(auto id = 0; id < (int)edge.size(); ++ id){
            if(ignore && ignore(id)) continue;
            res.orient(edge[id].to, edge[id].from, edge[id].cost);
        }
        return res;
    }
    int degree(int u) const{ // the degree (outdegree if directed) of u (without the ignoration rule)
        return (int)adj[u].size();
    }
    // The adjacency list is sorted for each vertex.
    vector<vector<int>> get_adjacency_list() const{
        vector<vector<int>> res(n);
        for(auto u = 0; u < n; ++ u) for(auto id: adj[u]){
            if(ignore && ignore(id)) continue;
            res[(*this)(u, id)].push_back(u);
        }
        return res;
    }
    void set_ignoration_rule(const function<bool(int)> &f){
        ignore = f;
    }
    void reset_ignoration_rule(){
        ignore = nullptr;
    }
    friend ostream &operator<<(ostream &out, const graph &g){
        for(auto id = 0; id < (int)g.edge.size(); ++ id){
            if(g.ignore && g.ignore(id)) continue;
            auto &e = g.edge[id];
            out << "{" << e.from << ", " << e.to << ", " << e.cost << "}\n";
        }
        return out;
    }
};

struct Query {
    int v, val, qid;
    Query(int v, int val, int qid) : v(v), val(val), qid(qid) {}
};

void solve() {
    int n, q;
    cin >> n >> q;

    graph<int> g(n);
    vector<int> tpq(n + q), res(n + q);
    vector<vector<Query>> queries(n);
    for (int i = 0; i < n - 1 + q; ++i) {
        char ch;
        cin >> ch;
        if (ch == 'S') {
            int u, v;
            cin >> u >> v;
            --u, --v;
            g.link(u, v, i);
            tpq[i] = 0;
        }
        else if (ch == 'Q') {
            int u, v;
            cin >> u >> v;
            --u, --v;
            queries[v].emplace_back(u, i, i);
            tpq[i] = 1;
        }
        else {
            int u;
            cin >> u;
            --u;
            queries[u].emplace_back(-1, i, i);
            tpq[i] = 2;
        }
    }

    for (int i = 0; i < n; ++i) {
        reverse(all(g.adj[i]));
    }

    int tot_sz = 0;
    vector<bool> vis(n);
    vector<int> sz(n);

    auto get_sz = [&](auto self, int u, int _pid) -> void {
        sz[u] = 1;
        for (auto id : g.adj[u]) if (id != _pid and not vis[g(u, id)]) {
            int v = g(u, id);
            self(self, v, id);
            sz[u] += sz[v];
        }
    };

    auto find_cen = [&](auto self, int u, int _pid) -> int {
        for (auto id : g.adj[u]) if (id != _pid and not vis[g(u, id)]) {
            int v = g(u, id);
            if (sz[v] > (tot_sz >> 1)) {
                return self(self, v, id);
            }
        }
        return u;
    };

    auto get_cen = [&](int v) -> int {
        get_sz(get_sz, v, -1);
        tot_sz = sz[v];
        return find_cen(find_cen, v, -1);
    };

    auto fenw = make_fenwick_tree_sum<int>();
    fenw.build(n + q);

    vector<int> vis_dfs(n, n + q);
    vector<pair<int, int>> rst;
    auto dfs1 = [&](auto self, int u, int _pid, int pw) -> void {
        for (auto [v, val, qid] : queries[u]) {
            if (v == -1) {
                res[qid] += fenw.prefix(val);
            }
            else {
                res[qid] |= (vis_dfs[v] <= val);
            }
        }
        for (auto id : g.adj[u]) if (id != _pid and not vis[g(u, id)] and g.edge[id].cost < pw) {
            int v = g(u, id);
            self(self, v, id, g.edge[id].cost);
        }
    };

    auto add = [&](int u, int pw) -> void {
        vis_dfs[u] = pw;
        fenw.update(pw, 1);
        rst.emplace_back(u, pw);
    };

    auto dfs2 = [&](auto self, int u, int _pid, int pw) -> void {
        add(u, pw);
        for (auto id : g.adj[u]) if (id != _pid and not vis[g(u, id)] and g.edge[id].cost > pw) {
            int v = g(u, id);
            self(self, v, id, g.edge[id].cost);
        }
    };

    auto reset = [&]() -> void {
        while (not rst.empty()) {
            auto [u, pw] = rst.back();
            rst.pop_back();
            vis_dfs[u] = n + q;
            fenw.update(pw, -1);
        }
    };

    auto centroid = [&](auto self, int u) -> void {
        vis[u] = true;
        for (auto id : g.adj[u]) if (not vis[g(u, id)]) {
            int v = g(u, id);
            add(u, g.edge[id].cost);
            dfs1(dfs1, v, -1, g.edge[id].cost);
            {
                auto [u, pw] = rst.back();
                rst.pop_back();
                vis_dfs[u] = n + q;
                fenw.update(pw, -1);
            }
            dfs2(dfs2, v, -1, g.edge[id].cost);
        }
        add(u, 0);
        for (auto [v, val, qid] : queries[u]) {
            if (v == -1) {
                res[qid] += fenw.prefix(val);
            }
            else {
                res[qid] |= (vis_dfs[v] <= val);
            }
        }
        reset();

        for (auto id : g.adj[u]) if (not vis[g(u, id)]) {
            int v = g(u, id);
            int nxt_cen = get_cen(v);
            self(self, nxt_cen);
        }
    };

    int cen = get_cen(0);
    centroid(centroid, cen);

    int cntq = 0;
    for (int i = 0; i < n + q - 1; ++i) {
        if (tpq[i] == 1) {
            ++cntq;
            cout << (res[i] ? "yes" : "no") << " \n";
        }
        else if (tpq[i] == 2)   {
            ++cntq;
            cout << res[i] << " \n";
        }
    }
    assert(cntq == q);
}

signed main() {

#ifndef CDuongg
    if (fopen(taskname".inp", "r"))
        assert(freopen(taskname".inp", "r", stdin)), assert(freopen(taskname".out", "w", stdout));
#else
    freopen("bai3.inp", "r", stdin);
    freopen("bai3.out", "w", stdout);
    auto start = chrono::high_resolution_clock::now();
#endif

    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1; //cin >> t;
    while(t--) solve();

#ifdef CDuongg
   auto end = chrono::high_resolution_clock::now();
   cout << "\n"; for(int i = 1; i <= 100; ++i) cout << '=';
   cout << "\nExecution time: " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
#endif

}

Compilation message

servers.cpp:84:18: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   84 |     int max_pref(auto pred) const{
      |                  ^~~~

Subtask #1
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 16 ms 5468 KB Output is correct
2 Correct 25 ms 6480 KB Output is correct
3 Correct 22 ms 6232 KB Output is correct
4 Correct 25 ms 6484 KB Output is correct
5 Correct 27 ms 6736 KB Output is correct
6 Correct 23 ms 6492 KB Output is correct

Subtask #2
0 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 16 ms 5468 KB Output is correct
2 Correct 25 ms 6480 KB Output is correct
3 Correct 22 ms 6232 KB Output is correct
4 Correct 25 ms 6484 KB Output is correct
5 Correct 27 ms 6736 KB Output is correct
6 Correct 23 ms 6492 KB Output is correct
7 Correct 17 ms 5212 KB Output is correct
8 Incorrect 27 ms 6144 KB Extra information in the output file
9 Halted 0 ms 0 KB -

Subtask #3
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5468 KB Output is correct
2 Correct 104 ms 23096 KB Output is correct
3 Correct 91 ms 22908 KB Output is correct

Subtask #4
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5468 KB Output is correct
2 Correct 104 ms 23096 KB Output is correct
3 Correct 91 ms 22908 KB Output is correct
4 Correct 16 ms 5212 KB Output is correct
5 Correct 89 ms 22616 KB Output is correct
6 Correct 66 ms 21200 KB Output is correct
7 Correct 67 ms 21372 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5468 KB Output is correct
2 Correct 215 ms 27196 KB Output is correct
3 Correct 206 ms 27144 KB Output is correct
4 Correct 163 ms 28468 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5468 KB Output is correct
2 Correct 215 ms 27196 KB Output is correct
3 Correct 206 ms 27144 KB Output is correct
4 Correct 163 ms 28468 KB Output is correct
5 Correct 16 ms 5212 KB Output is correct
6 Correct 199 ms 26884 KB Output is correct
7 Correct 180 ms 28228 KB Output is correct
8 Correct 201 ms 26564 KB Output is correct
9 Correct 196 ms 26556 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 5468 KB Output is correct
2 Correct 151 ms 21876 KB Output is correct
3 Correct 139 ms 20744 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 5468 KB Output is correct
2 Correct 151 ms 21876 KB Output is correct
3 Correct 139 ms 20744 KB Output is correct
4 Correct 18 ms 5200 KB Output is correct
5 Correct 164 ms 21768 KB Output is correct
6 Correct 154 ms 20740 KB Output is correct

Subtask #9
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5468 KB Output is correct
2 Correct 207 ms 27280 KB Output is correct
3 Correct 199 ms 27144 KB Output is correct
4 Correct 163 ms 28376 KB Output is correct
5 Correct 17 ms 5468 KB Output is correct
6 Correct 147 ms 21764 KB Output is correct
7 Correct 146 ms 20744 KB Output is correct
8 Correct 136 ms 21512 KB Output is correct
9 Correct 160 ms 21364 KB Output is correct
10 Correct 233 ms 24768 KB Output is correct
11 Correct 243 ms 24460 KB Output is correct

Subtask #10
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5468 KB Output is correct
2 Correct 207 ms 27280 KB Output is correct
3 Correct 199 ms 27144 KB Output is correct
4 Correct 163 ms 28376 KB Output is correct
5 Correct 17 ms 5468 KB Output is correct
6 Correct 147 ms 21764 KB Output is correct
7 Correct 146 ms 20744 KB Output is correct
8 Correct 136 ms 21512 KB Output is correct
9 Correct 160 ms 21364 KB Output is correct
10 Correct 233 ms 24768 KB Output is correct
11 Correct 243 ms 24460 KB Output is correct
12 Correct 21 ms 5212 KB Output is correct
13 Correct 204 ms 26888 KB Output is correct
14 Correct 174 ms 28108 KB Output is correct
15 Correct 193 ms 26628 KB Output is correct
16 Correct 188 ms 26628 KB Output is correct
17 Correct 16 ms 5212 KB Output is correct
18 Correct 155 ms 21764 KB Output is correct
19 Correct 145 ms 20736 KB Output is correct
20 Correct 145 ms 21000 KB Output is correct
21 Correct 144 ms 21076 KB Output is correct
22 Correct 249 ms 23884 KB Output is correct
23 Correct 253 ms 24468 KB Output is correct
24 Correct 259 ms 24840 KB Output is correct

Subtask #11
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5464 KB Output is correct
2 Correct 32 ms 6472 KB Output is correct
3 Correct 26 ms 6236 KB Output is correct
4 Correct 27 ms 6492 KB Output is correct
5 Correct 26 ms 6740 KB Output is correct
6 Correct 23 ms 6492 KB Output is correct
7 Correct 16 ms 5468 KB Output is correct
8 Correct 100 ms 23076 KB Output is correct
9 Correct 90 ms 22912 KB Output is correct
10 Correct 16 ms 5464 KB Output is correct
11 Correct 190 ms 27060 KB Output is correct
12 Correct 194 ms 27140 KB Output is correct
13 Correct 157 ms 28424 KB Output is correct
14 Correct 16 ms 5468 KB Output is correct
15 Correct 147 ms 21952 KB Output is correct
16 Correct 157 ms 20996 KB Output is correct
17 Correct 141 ms 21408 KB Output is correct
18 Correct 147 ms 21252 KB Output is correct
19 Correct 256 ms 23812 KB Output is correct
20 Correct 229 ms 23324 KB Output is correct
21 Correct 106 ms 22276 KB Output is correct
22 Correct 110 ms 21448 KB Output is correct
23 Correct 130 ms 20484 KB Output is correct
24 Correct 137 ms 20684 KB Output is correct
25 Correct 185 ms 24328 KB Output is correct
26 Correct 152 ms 19968 KB Output is correct
27 Correct 138 ms 19976 KB Output is correct

Subtask #12
0 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 17 ms 5464 KB Output is correct
2 Correct 32 ms 6472 KB Output is correct
3 Correct 26 ms 6236 KB Output is correct
4 Correct 27 ms 6492 KB Output is correct
5 Correct 26 ms 6740 KB Output is correct
6 Correct 23 ms 6492 KB Output is correct
7 Correct 16 ms 5468 KB Output is correct
8 Correct 100 ms 23076 KB Output is correct
9 Correct 90 ms 22912 KB Output is correct
10 Correct 16 ms 5464 KB Output is correct
11 Correct 190 ms 27060 KB Output is correct
12 Correct 194 ms 27140 KB Output is correct
13 Correct 157 ms 28424 KB Output is correct
14 Correct 16 ms 5468 KB Output is correct
15 Correct 147 ms 21952 KB Output is correct
16 Correct 157 ms 20996 KB Output is correct
17 Correct 141 ms 21408 KB Output is correct
18 Correct 147 ms 21252 KB Output is correct
19 Correct 256 ms 23812 KB Output is correct
20 Correct 229 ms 23324 KB Output is correct
21 Correct 106 ms 22276 KB Output is correct
22 Correct 110 ms 21448 KB Output is correct
23 Correct 130 ms 20484 KB Output is correct
24 Correct 137 ms 20684 KB Output is correct
25 Correct 185 ms 24328 KB Output is correct
26 Correct 152 ms 19968 KB Output is correct
27 Correct 138 ms 19976 KB Output is correct
28 Correct 16 ms 5212 KB Output is correct
29 Incorrect 26 ms 5776 KB Extra information in the output file
30 Halted 0 ms 0 KB -