Submission #418949

#	Time	Username	Problem	Language	Result	Execution time	Memory
418949		codebuster_10	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	762 ms	260948 KiB

bitaro

#include <bits/stdc++.h>

using namespace std ;

#define int int64_t //be careful about this 
#define endl "\n"
#define f(i,a,b) for(int i=int(a);i<int(b);++i)

#define pr pair
#define ar array
#define fr first
#define sc second
#define vt vector
#define pb push_back
#define eb emplace_back
#define LB lower_bound  
#define UB upper_bound
#define PQ priority_queue

#define sz(x) ((int)(x).size())
#define all(a) (a).begin(),(a).end()
#define allr(a) (a).rbegin(),(a).rend()
#define mem(a,b) memset(a, b, sizeof(a))

template<class A> void rd(vt<A>& v);
template<class T> void rd(T& x){ cin >> x; }
template<class H, class... T> void rd(H& h, T&... t) { rd(h) ; rd(t...) ;}
template<class A> void rd(vt<A>& x) { for(auto& a : x) rd(a) ;}

template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

template<typename T>
void __p(T a) {
  cout<<a; 
}
template<typename T, typename F>
void __p(pair<T, F> a) {
  cout<<"{";
  __p(a.first);
  cout<<",";
  __p(a.second);
  cout<<"}\n"; 
}
template<typename T>
void __p(std::vector<T> a) {
  cout<<"{";
  for(auto it=a.begin(); it<a.end(); it++)
    __p(*it),cout<<",}\n"[it+1==a.end()]; 
}
template<typename T, typename ...Arg>
void __p(T a1, Arg ...a) {
  __p(a1);
  __p(a...);
}
template<typename Arg1>
void __f(const char *name, Arg1 &&arg1) {
  cout<<name<<" : ";
  __p(arg1);
  cout<<endl;
}
template<typename Arg1, typename ... Args>
void __f(const char *names, Arg1 &&arg1, Args &&... args) {
  int bracket=0,i=0;
  for(;; i++)
    if(names[i]==','&&bracket==0)
      break;
    else if(names[i]=='(')
      bracket++;
    else if(names[i]==')')
      bracket--;
  const char *comma=names+i;
  cout.write(names,comma-names)<<" : ";
  __p(arg1);
  cout<<" | ";
  __f(comma+1,args...);
}

void setIO(string s = "") {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); 
  cin.exceptions(cin.failbit); 
	cout.precision(15);	cout << fixed;
  #ifdef ONLINE_JUDGE
  if(sz(s)){
  	freopen((s+".in").c_str(),"r",stdin);
  	freopen((s+".out").c_str(),"w",stdout);
  }
  #define __f(...) 0
  #endif
}
























#undef int 



const int N = 100000, B = 317, inf = 1e9;
pr<int,int> dis[N][B]; // 0 -> dis, 1 -> index
pr<int,int> tmp[B];
bool rem[N], rem_nodes[N];
int out[N], dp[N];

signed main(){
  setIO();
  f(i,0,N) f(j,0,B) dis[i][j] = {-inf,-1};
  mem(rem,false);
  
  int N,M,Q;
  rd(N,M,Q);
  vt<int> g[N], gt[N];
  f(_,0,M){
  	int u,v; rd(u,v); --u,--v;
  	g[v].pb(u);
  	gt[u].pb(v);
  }
  
  f(i,0,N){
  	dis[i][0] = {0,i};
  	for(auto j : g[i]){
  		int x = 0, y = 0, z = 0;
  		f(k,0,B) tmp[k] = {-inf,-1};
  		while(z < B){
  			if(dis[i][x].fr == -inf && dis[j][y].fr == -inf) break;
  			if(dis[i][x].sc == dis[j][y].sc){
  				tmp[z].fr = max(dis[i][x].fr, dis[j][y].fr + 1);
  				tmp[z].sc = dis[i][x].sc;
  				++z,++x,++y;
  			}else if(dis[i][x].fr > dis[j][y].fr + 1){
  				tmp[z] = dis[i][x];
  				++z,++x;
  			}else{
  				tmp[z] = dis[j][y];
  				++tmp[z].fr;
  				++z,++y;
  			}
  		}
  		f(k,0,B) dis[i][k] = tmp[k]; 
  	}
  }
  
  
  
  
  f(_,0,Q){
  	int T,Y; rd(T,Y); --T;
  	vt<int> C(Y);
  	for(auto& i : C) cin >> i, --i;

  	for(auto& i : C) rem[i] = true;
  	
  	if(Y < B){
  		bool done = false;
  		f(i,0,B){
  			if(dis[T][i].sc != -1 && !rem[dis[T][i].sc]){
  				cout << dis[T][i].fr << endl;
  				done = true; break;
  			}
  		}
  		if(!done)	cout << -1 << endl;
  	}else{
  		mem(rem_nodes,false);
  		mem(dp,0);
  		
  		queue<int> q;
  		f(i,0,N){
  			out[i] = sz(g[i]);
  			if(rem[i] && out[i] == 0){
  				q.push(i);
  			}
  		}
  		while(sz(q)){
  			int j = q.front(); q.pop();
  			dp[j] = -inf;
  			rem_nodes[j] = true;
  			for(auto k : gt[j]){
  				--out[k];
  				if(rem[k] && out[k] == 0){
  					q.push(k);
  				}
  			}
  		}
  		f(i,0,T+1){
  			if(rem_nodes[i] && i != T) continue;
  			for(auto j : g[i]) if(!rem_nodes[j]) ckmax(dp[i],dp[j]+1);
  		}
			cout << max(int(-1),dp[T]) << endl;
  	}
  	for(auto& i : C) rem[i] = false;
  }
}

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