Submission #778426

#	Time	Username	Problem	Language	Result	Execution time	Memory
778426		borisAngelov	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	2060 ms	9100 KiB

bitaro

#include <bits/stdc++.h>

using namespace std;

const int maxn = 100005;

int n, m, q;

vector<int> g[maxn];

bool bad[maxn];
int dp[maxn];

int calc(int node)
{
    dp[node] = 0;

    for (int i = node - 1; i >= 1; --i)
    {
        for (auto prv : g[i])
        {
            if (dp[prv] != -1)
            {
                dp[i] = max(dp[i], 1 + dp[prv]);
            }
        }
    }

    int ans = -1;

    for (int i = node; i >= 1; --i)
    {
        if (bad[i] == false)
        {
            ans = max(ans, dp[i]);
        }
    }

    return ans;
}

void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int main()
{
    fastIO();

    cin >> n >> m >> q;

    for (int i = 1; i <= m; ++i)
    {
        int x, y;
        cin >> x >> y;

        g[x].push_back(y);
    }

    for (int i = 1; i <= q; ++i)
    {
        int node, cnt;
        cin >> node >> cnt;

        memset(bad, false, sizeof(bad));
        memset(dp, -1, sizeof(dp));

        for (int j = 1; j <= cnt; ++j)
        {
            int next_node;
            cin >> next_node;

            bad[next_node] = true;
        }

        cout << calc(node) << "\n";
    }

    return 0;
}

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