Submission #948608

#	Time	Username	Problem	Language	Result	Execution time	Memory
948608		JakobZorz	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	2011 ms	15512 KiB

bitaro

#include<iostream>
#include<vector>
#include<queue>
#include<stack>
#include<algorithm>
#include<limits.h>
#include<math.h>
#include<map>
#include<set>
#include<unordered_map>
#include<unordered_set>
#include<iomanip>
#include<cstring>
#include<random>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
using namespace std;

int n,m,q;
vector<int>nodes[100000];
vector<int>rev[100000];

int solve(int src,vector<int>blocked){
    vector<int>in(n);
    vector<int>res(n);
    queue<int>q;
    for(int i=0;i<n;i++){
        in[i]=(int)rev[i].size();
        if(in[i]==0)
            q.push(i);
    }
    for(int i:blocked)
        res[i]=-1e9;
    while(q.size()){
        int node=q.front();
        q.pop();
        for(int ne:rev[node])
            res[node]=max(res[node],res[ne]+1);
        for(int ne:nodes[node]){
            in[ne]--;
            if(in[ne]==0)
                q.push(ne);
        }
    }
    return max(-1,res[src]);
}

void solve(){
    cin>>n>>m>>q;
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        a--;b--;
        nodes[a].push_back(b);
        rev[b].push_back(a);
    }
    while(q--){
        int src,k;
        cin>>src>>k;
        src--;
        vector<int>blocked(k);
        for(int&i:blocked){
            cin>>i;
            i--;
        }
        cout<<solve(src,blocked)<<"\n";
    }
}

int main(){
    ios::sync_with_stdio(false);cout.tie(NULL);cin.tie(NULL);
    //freopen("/Users/jakob/cp_testing/test.txt","r",stdin);//freopen("output.out","w",stdout);
    int t=1;//cin>>t;
    while(t--)solve();
    return 0;
}


/*

5 6 3
1 2
2 4
3 4
1 3
3 5
4 5
4 1 1
5 2 2 3
2 3 1 4 5
 
 
1
3
0

 */

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