Submission #567365

#	Time	Username	Problem	Language	Result	Execution time	Memory
567365		RealSnake	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	2 ms	2644 KiB

bitaro

#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;
typedef tree<pair<int, int>, null_type, less<pair<int,int>>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

#define ll long long
#define mod 1000000007

ofstream fout(".out");
ifstream fin(".in");

vector<int> node[100001];
int d[100001];
bool b[100001];

signed main() {

    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int n, m, q;
    cin >> n >> m >> q;
    for(int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        node[v].push_back(u);
    }
    if(q == 1) {
        for(int i = 1; i <= n; i++)
            d[i] = 1e9;
        int t, sz;
        cin >> t >> sz;
        for(int i = 0; i < sz; i++) {
            int x;
            cin >> x;
            b[x] = 1;
        }
        set<pair<int, int>> s;
        s.insert({0, t});
        d[t] = 0;
        while(s.size()) {
            pair<int, int> p = *s.begin();
            s.erase(s.begin());
            int x = p.second;
            int cost = p.first;
            if(cost > d[x])
                continue;
            for(int i : node[x]) {
                if(cost + 1 < d[i]) {
                    d[i] = cost + 1;
                    s.insert({cost + 1, i});
                }
            }
        }
        int ans = -1;
        for(int i = 1; i <= n; i++) {
            if(!b[i]) 
                ans = max(ans, d[i]);
        }
        cout << ans << "\n";
    }

    return 0;
}

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