Submission #674921

#	Time	Username	Problem	Language	Result	Execution time	Memory
674921		Denkata	Bitaro’s Party (JOI18_bitaro)	C++17	0 / 100	3 ms	4948 KiB

bitaro

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
vector <int> v[100006];
int i,j,p,q,n,m,k,y,t;
int Q;
vector <pair <int,int>> best[100006];
const int crit = 3200;
int used[100006];
int dp[100006];
int covered[100006];
int dfs(int u)
{
    if(covered[u]==Q)
        return dp[u];
    covered[u]=Q;
    dp[u]=-1;
    if(used[u]!=Q)dp[u]=0;
    for(auto j:v[u])
    {
        int val = dfs(j);
        if(val!=-1)
            dp[u]=max(dp[u],1+val);
    }
    return dp[u];
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>m>>Q;
    for(i=1; i<=m; i++)
    {
        cin>>p>>q;
        v[q].push_back(p);
    }
    for(i=1; i<=n; i++)
    {
        for(auto j:v[i])
        {
            best[i].push_back({-1,j});
            for(auto k:best[j])
                best[i].push_back({k.first-1,k.second});
        }
        sort(best[i].begin(),best[i].end());
        while(best[i].size()>crit)
            best[i].pop_back();
    }
    while(Q--)
    {
        int party;
        cin>>party;
        cin>>y;
        for(i=1; i<=y; i++)
        {
            cin>>t;
            used[t]=Q;
        }
        bool fl=0;
        for(i=0; i<best[party].size(); i++)
        {
            if(used[best[party][i].second]!=Q)
            {
                cout<<abs(best[party][i].first)<<endl;
                fl=1;
                break;
            }
        }
        if(fl)continue;
        if(y<crit)
        {
            if(used[party]==Q)
                cout<<-1<<endl;
            else cout<<0<<endl;
            continue;
        }
        cout<<dfs(party)<<endl;
    }
    return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         for(i=0; i<best[party].size(); i++)
      |                  ~^~~~~~~~~~~~~~~~~~~

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