Submission #567269

#	Time	Username	Problem	Language	Result	Execution time	Memory
567269		shrimb	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	2087 ms	18400 KiB

bitaro

#pragma GCC optimize ("Ofast")
#pragma GCC target ("avx,avx2,fma")

#include"bits/stdc++.h"
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;

#define int long long
#define endl '\n'
#define mod 1000000007
//\
#define mod 1686876991

const int maxn = 100001;
const int sq = sqrt(maxn);

vector<int> adj[maxn], radj[maxn];

int n, m, q;

pair<int,int> dp[maxn][sq];
int dp2[maxn];
int c[maxn];
bitset<maxn> rem;

signed main () {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> m >> q;

    for (int i = 0 ; i < m ; i++) {
        int a, b;
        cin >> a >> b;
        adj[a].push_back(b);
        radj[b].push_back(a);
    }

    for (int i = 1 ; i <= n ; i++) {
        for (int j = 0 ; j < sq ; j++) dp[i][j] = {-1e9,-1};
        dp[i][0] = {0, i};
    }
    for (int i = 1 ; i <= n ; i++) {
        vector<pair<int,int>> v;
        for (auto k : dp[i]) {
            if (k.second == -1) break;
            v.push_back(k);
        }
        for (int j : radj[i]) {
            for (auto k : dp[j]) {
                if (k.second == -1) break;
                v.push_back({k.first + 1, k.second});
            }
        }

        sort(v.begin(), v.end(), greater<pair<int,int>>());
        // cerr << v.size() << endl;
        for (int j = 0 ; j < min(sq, (int)v.size()) ; j++) dp[i][j] = v[j];
        // cerr << "here\n";
    }

    for (int i = 0 ; i < q ; i++) {
        int t, y;
        cin >> t >> y;
        for (int j = 0 ; j < y ; j++) cin >> c[j], rem[c[j]] = 1;
        if (y < sq) {
            for (int j = 0 ; j < sq ; j++) {
                if (dp[t][j].second == -1) break;
                if (!rem[dp[t][j].second]) {
                    cout << dp[t][j].first << endl;
                    goto good;
                }
            }
            cout << -1 << endl;
            good:;
        } else {
            for (int j = 1 ; j <= t ; j++) {
                dp2[j] = (rem[j] ? -1e9 : 0);
                for (int k : radj[j]) dp2[j] = max(dp2[j], dp2[k] + 1);
            }
            if (dp2[t] < 0) cout << -1 << endl;
            else cout << dp2[t] << endl;
        }
        for (int j = 0 ; j < y ; j++) rem[c[j]] = 0;
    }
}

Compilation message (stderr)

bitaro.cpp:17:1: warning: multi-line comment [-Wcomment]
   17 | //\
      | ^

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