Submission #707827

#	Time	Username	Problem	Language	Result	Execution time	Memory
707827		ToroTN	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	2 ms	2644 KiB

bitaro

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
int n,m,t,u_i,v_i,num,ban[100005],root=sqrt(100000),dp[100005];
int hsh[100005],party;
vector<int> from[100005];
int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0);
    root=0;
    cin >> n >> m >> t;
    for(int i=1;i<=m;i++)
    {
        cin >> u_i >> v_i;
        from[v_i].pb(u_i);
    }
    while(t--)
    {
        cin >> party >> num;
        for(int i=1;i<=num;i++)
        {
            cin >> ban[i];
            hsh[ban[i]]=1;
        }
        if(num>root)
        {
            for(int i=1;i<=n;i++)
            {
                dp[i]=-1e9;
                if(hsh[i]==0)dp[i]=0;
                for(auto node:from[i])
                {
                    dp[i]=max(dp[i],dp[node]+1);
                }
            }
            if(dp[party]==-1e9)
            {
                printf("-1\n");
            }else
            {
                printf("%d\n",dp[party]);
            }
        }else
        {

        }
        for(int i=1;i<=num;i++)
        {
            hsh[ban[i]]=0;
        }
    }
}

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