Submission #745614

#	Time	Username	Problem	Language	Result	Execution time	Memory
745614		mars4	Bitaro’s Party (JOI18_bitaro)	C++17	100 / 100	1231 ms	516932 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 i128            __int128_t
#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 T> ostream& operator<<(ostream& out,ordered_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;
	ll q;
	const ll B=200;
	cin>>n>>m>>q;
	vector<vector<ll>> v(n);
	vector<vector<pair<ll,ll>>> dist(n);
	forn(i,0,m)
	{
		cin>>l>>r;
		l--,r--;
		v[r].push_back(l);
	}
	vector<ll> visited(n,-1);
	vector<ll> pos(n);
	forn(i,0,n)
	{
		dist[i].push_back({0,i});
		for(ll nxt:v[i])
		{
			for(auto [d,ind]:dist[nxt])
			{
				if(visited[ind]!=i)
				{
					pos[ind]=(ll)dist[i].size();
					visited[ind]=i;
					dist[i].push_back({d+1,ind});
				}
				else if(dist[i][pos[ind]].ff<d+1)
				{
					dist[i][pos[ind]].ff=d+1;
				}
			}
		}
		sort(all(dist[i]),greater<pair<ll,ll>>());
		h=(ll)dist[i].size();
		if(h>B)
		{
			dist[i].resize(B);
		}
	}
	vector<ll> mark(n,-1);
	vector<ll> len(n);
	forn(i,0,q)
	{
		ll town;
		cin>>town>>k;
		town--;
		forn(j,0,k)
		{
			cin>>r;
			r--;
			mark[r]=i;
		}
		ll ans=-1;
		if(k<B)
		{
			for(auto [d,ind]:dist[town])
			{
				if(mark[ind]!=i)
				{
					ans=d;
					break;
				}
			}
		}
		else
		{
			forn(j,0,town+1)
			{
				len[j]=(mark[j]==i)?-inf:0;
				for(ll nxt:v[j])
				{
					len[j]=max(len[j],len[nxt]+1);
				}
			}
			ans=max(len[town],(ll)-1);
		}
		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:49:5: warning: unused variable 'z' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |     ^
bitaro.cpp:49:11: warning: unused variable 't' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |           ^
bitaro.cpp:49:15: warning: unused variable 'i' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |               ^
bitaro.cpp:49:17: warning: unused variable 'j' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                 ^
bitaro.cpp:49:21: warning: unused variable 'd' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                     ^

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