Submission #1251876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251876		tkm_algorithms	Bitaro’s Party (JOI18_bitaro)	C++20	0 / 100	7 ms	8792 KiB

bitaro

/**
*    In the name of Allah
*    We are nothing and you're everything
*    Ya Muhammad!
**/
#include <bits/stdc++.h>
#ifdef LOCAL
#define debug(x) cerr << #x << "= " << x << endl;
#else 
#define debug(x)
#endif
using namespace std;
using ll = long long;
using ull = uint64_t;
 
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define mp(x, y) make_pair(x, y)
#define pii pair<int, int>
//#define int long long
 
const char nl = '\n';
const int N = 1e5+5;
const int inf = 1e9;

vector<int> g[N], ind(N);
vector<pii> v[N];
vector<bool> vis(N);
const int bl = 100;

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    int n, m, q; cin >> n >> m >> q;
    for (int i = 0; i < m; ++i) {
        int a, b; cin >> a >> b;
        g[b].push_back(a);
    }
    
    for (int i = 1; i <= n; ++i) {
        priority_queue<pii> pq;
        for (auto j: g[i])
            pq.push(mp(v[j][0].first, j));
        while (!pq.empty() && sz(v[i])<bl) {
            auto [d, x] = pq.top(); pq.pop();
            int y = v[x][ind[x]].second;
            
            if (!vis[y]) {
                vis[y] = true;
                v[i].push_back(mp(d+1, y));
            }
            
            ind[x] += 1;
            if (ind[x] < sz(v[x]))pq.push(mp(v[x][ind[x]].first, x));
        }
        v[i].push_back(mp(0, i));
        for (auto j: v[i])vis[j.second] = 0;
        for (auto j: g[i])ind[j] = 0;
    }
    
    vector<bool> was(n+1);
    for (; q>0; --q) {
        int t, y; cin >> t >> y;
        vector<int> c(y);
        for (auto &i: c) {
            cin >> i;
            was[i] = true;
        }
            
        bool ok = false;
        for (auto j: v[t])
            if (!was[j.second]) {
                cout << j.first << nl;
                ok = true; break;
            }
        
        if (!ok) {
            vector<int> dp(n+1);
            for (int i = 1; i <= t; ++i) {
                dp[i] = (was[i]?-inf:0);
                for (auto j: g[i])dp[i] = max(dp[i], dp[j]+1);
            }
            cout << (dp[t]<0?-1:dp[t]) << nl;
        }
        for (auto i: c)was[i] = 0;
    }
    return 0;
}

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