Submission #531163

#	Time	Username	Problem	Language	Result	Execution time	Memory
531163		4fecta	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	2000 ms	481840 KiB

bitaro

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define ld long double
#define pii pair<int, int>
#define f first
#define s second
#define boost() cin.tie(0), cin.sync_with_stdio(0)

const int MN = 200005, BLK = 100;

int n, m, q, u, v, k, dp[MN];
vector<int> a[MN], r[MN];
vector<pii> far[MN];

int32_t main() {
    boost();

    cin >> n >> m >> q;
    for (int i = 1; i <= m; i++) {
        cin >> u >> v;
        a[u].push_back(v);
        r[v].push_back(u);
    }
    for (int i = 1; i <= n; i++) {
        far[i].push_back({0, i});
        for (int j : r[i]) for (pii p : far[j]) far[i].push_back({p.f + 1, p.s});
        sort(far[i].begin(), far[i].end(), greater<>());
        while (far[i].size() > BLK) far[i].pop_back();
    }
    for (int i = 1; i <= q; i++) {
        cin >> u >> k;
        set<int> s;
        for (int j = 1; j <= k; j++) cin >> v, s.insert(v);
        if (k >= BLK) {
            int ans = -1;
            dp[u] = 0;
            if (!s.count(u)) ans = 0;
            for (int j = u - 1; j > 0; j--) {
                dp[j] = -0x3f3f3f3f;
                for (int nxt : a[j]) if (nxt <= u) dp[j] = max(dp[j], dp[nxt] + 1);
                if (!s.count(j)) ans = max(ans, dp[j]);
            }
            printf("%lld\n", ans);
        } else {
            int ans = -1;
            for (pii p : far[u]) if (!s.count(p.s)) {ans = p.f; break;}
            printf("%lld\n", ans);
        }
    }

    return 0;
}

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