Submission #700048

#	Time	Username	Problem	Language	Result	Execution time	Memory
700048		urosk	Bitaro’s Party (JOI18_bitaro)	C++14	7 / 100	2076 ms	212756 KiB

bitaro

#define here cerr<<"===========================================\n"
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#include "bits/stdc++.h"
//#include <ext/pb_ds/tree_policy.hpp>
//#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll int
#define llinf 1LL // 10^17
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) (ll)(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {cerr<<#a<<": ";for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
#define cer(a) {cerr<<#a<<": ";for(ll x_ : a) cerr<<x_<< " ";cerr<<endl;}

#define daj_mi_malo_vremena ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);

using namespace std;
//using namespace __gnu_pbds;
/*
ll add(ll x,ll y){
    x+=y;
    if(x<0){
        x%=mod;
        x+=mod;
    }else{
        if(x>=mod) x%=mod;
    }
    return x;
}
ll mul(ll a,ll b){
	ll ans = (a*b)%mod;
	if(ans<0) ans+=mod;
	return ans;
}
typedef tree<int,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
typedef tree<int,null_type,less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_multiset;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll rnd(ll l,ll r){
    return uniform_int_distribution<ll>(l,r)(rng);
}
*/
#define maxn 100005
ll n,m,Q;
ll d = 500;
vector<ll> g[maxn],rg[maxn];
vector<pll> v[maxn];
ll deg[maxn],dp[maxn];
bool cmp(pll a,pll b){return a.sc>b.sc;}
bool bad[maxn],vis[maxn];
void dfs(ll u){
    vis[u] = 1;
    for(ll s : rg[u]){
        if(!vis[s]) dfs(s);
        if(dp[s]==-llinf) continue;
        dp[u] = max(dp[u],dp[s]+1);
    }
}
void tc(){
    cin >> n >> m >> Q;
    for(ll i = 1;i<=m;i++){
        ll x,y; cin >> x >> y;
        g[x].pb(y);
        deg[y]++;
        rg[y].pb(x);
    }
    queue<ll> q;
    for(ll i = 1;i<=n;i++){
        if(deg[i]) continue;
        q.push(i);
    }
    while(sz(q)){
        ll u = q.front();
        q.pop();
        v[u].pb({u,0});
        for(ll s : rg[u]) for(pll p : v[s]) v[u].pb({p.fi,p.sc+1});
        vector<pll> w;
        sort(all(v[u]));
        for(ll i = 0;i<sz(v[u]);i++){
            if(i==sz(v[u])-1||v[u][i].fi!=v[u][i+1].fi) w.pb(v[u][i]);
        }
        v[u].clear();
        for(pll x : w) v[u].pb(x);
        sort(all(v[u]),cmp);
        while(sz(v[u])>d) v[u].popb();
        for(ll s : g[u]){
            deg[s]--;
            if(!deg[s]) q.push(s);
        }
    }
    while(Q--){
        ll c,u;
        cin >> u >> c;
        vector<ll> w(c);
        for(ll &x : w){
            cin >> x;
            bad[x] = 1;
        }
        if(c<d){
            for(pll p : v[u]){
                if(!bad[p.fi]){
                    cout<<p.sc<<endl;
                    goto lol;
                }
            }
            cout<<-1<<endl;
            lol:;
        }else{
            for(ll i = 1;i<=n;i++){
                if(bad[i]) dp[i] = -llinf;
                else dp[i] = 0;
                vis[i] = 0;
            }
            dfs(u);
            if(dp[u]==-llinf) dp[u] = -1;
            cout<<dp[u]<<endl;
        }
        for(ll x : w) bad[x] = 0;
    }
}
int main(){
	daj_mi_malo_vremena
    int t; t = 1;
    while(t--){
        tc();
    }
	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
**/

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