Submission #1143429

#	Time	Username	Problem	Language	Result	Execution time	Memory
1143429		steveonalex	Keys (IOI21_keys)	C++20	37 / 100	3099 ms	130956 KiB

keys

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ull mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int N = 3e5 + 69, INF = 1e9 + 69;
int n, m;
vector<pair<int, int>> graph[N];

bool add_set(vector<int> &S, vector<bool> &mark, int c){
    if (mark[c] == false){
        mark[c] = true;
        S.push_back(c);
        return true;
    }
    return false;
}

void clear_set(vector<int> &S, vector<bool> &mark){
    for(int i: S) mark[i] = false;
    S.clear();
}

vector<int> find_reachable(vector<int> r, vector<int> U, vector<int> V, vector<int> C) {
    n = r.size(), m = U.size();

    int mi = INF;
    vector<int> optimal_vertice_set;

    for(int i = 0; i < m; ++i){
        int u= U[i], v = V[i], c = C[i];
        graph[u].push_back({v, c});
        graph[v].push_back({u, c});
    }

    for(int i = 0; i < n; ++i) shuffle(ALL(graph[i]), rng);

    vector<int> perm(n);
    for(int i = 0; i < n; ++i) perm[i] = i;
    shuffle(ALL(perm), rng);

    vector<int> p(n, -1);
    vector<vector<int>> reached(n);

    vector<bool> color_mark(n), vertice_mark(n);
    vector<int> reached_color, reached_vertices;

    vector<vector<int>> waiting_edge(n);
    for(int i: perm){   
        add_set(reached_vertices, vertice_mark, i);

        vector<int> st; st.push_back(i);
        vector<int> color_used;
        while(st.size()){
            int u = st.back(); st.pop_back();
            add_set(reached_color, color_mark, r[u]);
            for(int v: waiting_edge[r[u]]){
                if (add_set(reached_vertices, vertice_mark, v)) {
                    st.push_back(v);
                }
            }
            waiting_edge[r[u]].clear();
            for(pair<int, int> v: graph[u]) {
                if (color_mark[v.second]) {
                    if (add_set(reached_vertices, vertice_mark, v.first))
                        st.push_back(v.first);
                }
                else{
                    if (vertice_mark[v.first] == false){
                        color_used.push_back(v.second);
                        waiting_edge[v.second].push_back(v.first);
                    }
                }
            }
        }

        reached[i] = reached_vertices;
        p[i] = reached_vertices.size();

        for(int i: color_used) waiting_edge[i].clear();
        clear_set(reached_color, color_mark);
        clear_set(reached_vertices, vertice_mark);
    }

    for(int i = 0; i < n; ++i) {
        if (minimize(mi, p[i])) {
            optimal_vertice_set.clear();
            optimal_vertice_set.push_back(i);
        }
        else if (mi == p[i]){
            optimal_vertice_set.push_back(i);
        }
    }

    vector<int> ans(n);
    for(int i: optimal_vertice_set) ans[i] = true;
    return ans;
}


// int main(void){
//     ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);

//     clock_t start = clock();

//     int n, m; cin >> n >> m;
//     vector<int> r(n);
//     for(int i = 0; i < n; ++i) cin >> r[i];

//     vector<int> u(m), v(m), c(m);
//     for(int i = 0; i < m; ++i)
//         cin >> u[i] >> v[i] >> c[i];

//     vector<int> ans = find_reachable(r, u, v, c);
//     printArr(ans);
    

//     cerr << "Time elapsed: " << clock() - start << " ms\n";
//     return 0;
// }

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33