Submission #291731

#	Time	Username	Problem	Language	Result	Execution time	Memory
291731		YJU	Bitaro’s Party (JOI18_bitaro)	C++14	100 / 100	1804 ms	421496 KiB

bitaro

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef int ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=1e5+5;
const ll K=350;
const ld pi=3.14159265359;
const ll INF=(1LL<<30);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()


ll n,m,q,x,y,ans=-1,T,is[N],dp[N],id[N];
vector<ll> lis,ed[N],red[N];
vector<pll> pre[N];

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>m>>q;
	REP(i,m){
		cin>>x>>y;
		ed[x].pb(y);
		red[y].pb(x);	
	}
	REP1(i,n){
		for(ll j:red[i])id[j]=0;
		REP(j,K){
			pll mx=mp(i,0);
			for(ll ii:red[i]){
				while(id[ii]<SZ(pre[ii])&&is[pre[ii][id[ii]].X])++id[ii];
				if(id[ii]>=SZ(pre[ii]))continue;
				if(mx.Y<pre[ii][id[ii]].Y+1)mx=mp(pre[ii][id[ii]].X,pre[ii][id[ii]].Y+1);
			}
			//if(mx.X==i)break;
			pre[i].pb(mx);
			is[mx.X]=1;
			lis.pb(mx.X);
		}
		for(ll j:lis)is[j]=0;
		lis.clear();
	}
	while(q--){
		cin>>x>>T;
		REP(i,T)cin>>y,lis.pb(y),is[y]=1;
		if(T>=K){
			REP1(i,n)dp[i]=-INF;
			dp[x]=0;
			if(!is[x])ans=0;
			for(int i=x-1;i>=1;i--){
				for(auto j:ed[i]){
					dp[i]=max(dp[i],dp[j]+1);
					if(!is[i])ans=max(ans,dp[i]);
				}
			}
			cout<<ans<<"\n";
		}else{
			for(auto i:pre[x])if(!is[i.X])ans=max(ans,i.Y);
			cout<<ans<<"\n";
		}
		for(ll i:lis)is[i]=0;
		ans=-1;
		lis.clear();
	}
	return 0;
}

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