Submission #1125015

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125015		LaMatematica14	Bitaro’s Party (JOI18_bitaro)	C++20	0 / 100	1 ms	320 KiB

bitaro

#include <bits/stdc++.h>
using namespace std;
const int rad = 333;
int N;
vector<vector<int>> adj;
vector<vector<pair<int, int>>> dp;

void crea(int a) {
    unordered_set<int> pr;
    int dc = adj[a].size();
    vector<int> id(dc, 0);
    bool ff = 1;
    int h = 0;
    while (h < rad) {
        int best = -1, idb = -1;
        for (int i = 0; i < dc; i++) {
            while (id[i] < dp[adj[a][i]].size() && pr.count(dp[adj[a][i]][id[i]].second)) id[i]++;
            if (id[i] >= dp[adj[a][i]].size()) continue;
            if (dp[adj[a][i]][id[i]].first > best) {
                idb = i;
                best = dp[adj[a][i]][id[i]].first; 
            }
        }
        if (idb < 0) {
            ff = 0; break;
        }
        pr.insert(dp[adj[a][idb]][id[idb]].second);
        dp[a][h] = dp[adj[a][idb]][id[idb]];
        dp[a][h++].first++;
        id[idb]++;
    }
    if (h < rad) dp[a][h] = {a, 0};
}

int bfs(int a, bitset<100001> &bs) {
    vector<int> dist(N, -1000000000);
    for (int i = 1; i <= a; i++) {
        if (!bs[i]) dist[i] = 0;
        for (int x : adj[i]) dist[i] = max(dist[i], dist[x]+1);
    }
    return max(-1, dist[a]);
}

int prec(int a, bitset<100001> &bs) {
    int m = -1;
    for (int i = 0; i < dp[a].size(); i++) {
        if (bs[dp[a][i].second]) continue;
        m = max(m, dp[a][i].first);
    }
    return m;
}


int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL); cout.tie(NULL);

    int M, Q; cin >> N >> M >> Q;
    adj.resize(N+1); dp = vector<vector<pair<int, int>>> (N+1, vector<pair<int, int>> (rad, {-1, -1}));
    for (int i = 0; i < M; i++) {
        int s, t; cin >> s >> t;
        adj[t].push_back(s);
    }
    
    for (int i = 1; i <= N; i++) crea(i);
    bitset<100001> bs;
    for (int i = 0; i < Q; i++) {
        int a, y; cin >> a >> y;
        vector<int> qc(y);
        for (int j = 0; j < y; j++) {
            cin >> qc[j];
            bs[qc[j]] = 1; 
        }

        if (y >= rad) cout << bfs(a, bs) << "\n";
        else cout << prec(a, bs) << "\n";

        for (int j = 0; j < y; j++) bs[qc[j]] = 0; 
    }
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86