Submission #484115

#	Time	Username	Problem	Language	Result	Execution time	Memory
484115		mars4	Bitaro’s Party (JOI18_bitaro)	C++17	100 / 100	853 ms	214604 KiB

bitaro

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 

using namespace std;
using namespace __gnu_pbds; 

#define ff              first
#define ss              second
#define ll              int64_t
#define ld              long double
#define nl              cout<<"\n"
#define all(v)          v.begin(),v.end()
#define mset(a,v)       memset((a),(v),sizeof(a))
#define forn(i,a,b)     for(int64_t i=int64_t(a);i<int64_t(b);++i)
#define forb(i,a,b)     for(int64_t i=int64_t(a);i>=int64_t(b);--i)
#define fastio()        ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define mod         1'000'000'007
#define mod2        998'244'353 
#define inf         1'000'000'000'000'007
#define pi          3.14159265358979323846

template<class key,class cmp=std::less<key>>
using ordered_set=tree<key,null_type,cmp,rb_tree_tag,tree_order_statistics_node_update>;

template<class L,class R> ostream& operator<<(ostream& out,pair<L,R> &p)        {return out<<"("<<p.ff<<", "<<p.ss<<")";}
template<class T> ostream& operator<<(ostream& out,vector<T> &v)                {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,deque<T> &v)                 {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,set<T> &s)                   {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class L,class R> ostream& operator<<(ostream& out,map<L,R> &m)         {out<<"{";for(auto it=m.begin();it!=m.end();++it){if(it!=m.begin())out<<", ";out<<*it;}return out<<"}";}

void dbg_out() {cerr<<"]\n";}
template<typename Head,typename... Tail> 
void dbg_out(Head H,Tail... T) {cerr<<H;if(sizeof...(Tail))cerr<<", ";dbg_out(T...);}
#ifdef LOCAL
	#define dbg(...) cerr<<"["<<#__VA_ARGS__<<"] = [",dbg_out(__VA_ARGS__)
#else
	#define dbg(...)
#endif

//---------------------------------mars4---------------------------------

int main()
{
	fastio();
	ll z,n,m,t,k,i,j,l,d,h,r;
	const ll B=100;
	cin>>n>>m>>k;
	vector<vector<ll>> v(n);
	forn(i,0,m)
	{
		cin>>l>>r;
		l--,r--;
		v[r].push_back(l);
	}
	vector<ll> vis(n,-1);
	vector<vector<pair<ll,ll>>> dist(n);
	vector<ll> len(n);
	forn(i,0,n)
	{
		vector<ll> nodes;
		nodes.push_back(i);
		for(ll pr:v[i])
		{
			for(auto [cnt,frm]:dist[pr])
			{
				if(vis[frm]!=i)
				{
					vis[frm]=i;
					len[frm]=cnt+1;
					nodes.push_back(frm);
				}
				else
				{
					len[frm]=max(len[frm],cnt+1);
				}
			}
		}
		sort(all(nodes),[&](ll u,ll v){
			return len[u]>len[v];
		});
		ll n2=(ll)nodes.size();
		forn(j,0,min(n2,B))
		{
			dist[i].push_back({len[nodes[j]],nodes[j]});
		}
	}
	vector<ll> mark(n,-1);
	while(k--)
	{
		ll node,n2;
		cin>>node>>n2;
		node--;
		vector<ll> na(n2);
		for(ll &i:na)
		{
			cin>>i;
			i--;
			mark[i]=k;
		}
		ll ans=-1;
		if(n2>=B)
		{
			vector<ll> len2(n);
			forn(i,0,node+1)
			{
				if(mark[i]==k)
				{
					len2[i]=-inf;
				}
				for(ll j:v[i])
				{
					len2[i]=max(len2[i],len2[j]+1);
				}
			}
			ans=max(ans,len2[node]);
		}
		else
		{
			for(auto [cnt,frm]:dist[node])
			{
				if(mark[frm]!=k)
				{
					ans=cnt;
					break;
				}
			}
		}
		cout<<ans<<"\n";
	}
	cerr<<"\nTime elapsed: "<<1000*clock()/CLOCKS_PER_SEC<<"ms\n";
	return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:47:5: warning: unused variable 'z' [-Wunused-variable]
   47 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |     ^
bitaro.cpp:47:11: warning: unused variable 't' [-Wunused-variable]
   47 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |           ^
bitaro.cpp:47:15: warning: unused variable 'i' [-Wunused-variable]
   47 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |               ^
bitaro.cpp:47:17: warning: unused variable 'j' [-Wunused-variable]
   47 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                 ^
bitaro.cpp:47:21: warning: unused variable 'd' [-Wunused-variable]
   47 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                     ^
bitaro.cpp:47:23: warning: unused variable 'h' [-Wunused-variable]
   47 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                       ^

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