Submission #578314

#	Time	Username	Problem	Language	Result	Execution time	Memory
578314		handlename	Game (APIO22_game)	C++17	100 / 100	1277 ms	69764 KiB

game

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
const int MOD=1e9+7;
int n,k;
vector<int> adj[300001],rev[300001];
pair<int,int> range[300001];
//rightmost special node to go i, leftmost special node i can go to
void init(int N,int K){
	n=N;
	k=K;
	for (int i=1;i<=k;i++){
		//adj[i].pb(i+1);
		//rev[i+1].pb(i);
		range[i]=mp(i,i);
	}
	for (int i=k+1;i<=n;i++){
		range[i]=mp(0,k+1);
	}
}
bool upd(int u,int v){
	if (range[u].second<=range[v].first) return false;
	if (range[u].first>=range[v].second) return true;
	if (range[u]==range[v]) return false;
	//u1 u u2
	//v1 v v2
	//u2>v1 and u1<v2
	//if we use u->v edge,v1=max(u1,v1) and u2=min(u2,v2)
	if ((range[v].first+range[v].second)/2<range[u].first){
		while ((range[v].first+range[v].second)/2<range[u].first){
			range[v].first=(range[v].first+range[v].second)/2+1;
		}
		for (auto i:adj[v]){
			if (upd(v,i)) return true;
		}
	}
	if ((range[u].second+range[u].first)/2>=range[v].second){
		while ((range[u].second+range[u].first)/2>=range[v].second){
			range[u].second=(range[u].second+range[u].first)/2;
		}
		for (auto i:rev[u]){
			if (upd(i,u)) return true;
		}
	}
	return false;	
}
int add_teleporter(int u,int v){
	u++;
	v++;
	if (u>=v && u<=k) return 1;
	if (u==v) return 0;
	adj[u].pb(v);
	rev[v].pb(u);
	return upd(u,v);
}

• Subtask 1: 2 / 2
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 30 / 30
• Subtask 5: 40 / 40