제출 #338774

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
338774		ogibogi2004	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1090 ms	101648 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
const int MAXN=3e4+2;
const int INF=2e9;
int n,m;
struct doge
{
	int p,pos;
	bool operator<(const doge& other)
	{
		if(pos!=other.pos)return pos<other.pos;
		return p<=other.p;
	}
}d[MAXN];
struct state
{
	int pos,p,d;
	bool operator<(state const& other)const
	{
		if(d!=other.d)return d>other.d;
		return make_pair(p,pos)<make_pair(other.p,other.pos);
	}
};
set<pair<int,int> >doges;
set<int>doges1[MAXN];
vector<pair<int,int> >states;
unordered_map<int,int>dist[MAXN];
int main()
{
	srand(654);
	int e=rand();
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	cin>>n>>m;
	for(int i=0;i<m;++i)
	{
		cin>>d[i].pos>>d[i].p;
		doges.insert({d[i].p,d[i].pos%d[i].p});
		doges1[d[i].pos].insert(d[i].p);
	}
	for(auto t:doges)
	{
		for(int i=t.second;i<n;i+=t.first)
		{
			states.push_back({i,t.first});
		}
	}
	//dist.reserve(states.size());
	for(auto s:states)
	{
		dist[s.first][(s.second^e)]=INF;
	}
	priority_queue<state>pq;
	pq.push({d[0].pos,d[0].p,0});
	dist[d[0].pos][d[0].p^e]=0;
	while(!pq.empty())
	{
		state u=pq.top();pq.pop();
		if(dist[u.pos][u.p^e]<u.d)continue;
		if(u.pos==d[1].pos&&u.p==d[1].p)break;
		//if(clock()>0.9*CLOCKS_PER_SEC)break;
		//cout<<u.pos<<" "<<u.p<<endl;
		if(doges1[u.pos].size()>0)
		{
			auto it=doges1[u.pos].lower_bound(u.p);
			if(it!=doges1[u.pos].end()&&(*it)!=u.p)
			{
				auto d1=(*it);
				if(dist[u.pos][d1^e]>u.d)
				{
					dist[u.pos][d1^e]=u.d;
					pq.push({u.pos,d1,u.d});
				}
			}
			if(it!=doges1[u.pos].begin())
			{
				--it;
				auto d1=(*it);
				if(dist[u.pos][d1^e]>u.d)
				{
					dist[u.pos][d1^e]=u.d;
					pq.push({u.pos,d1,u.d});
				}
				++it;
			}
			//cout<<"**\n";
			if(it!=doges1[u.pos].end())++it;
			if(it!=doges1[u.pos].end())
			{
				auto d1=(*it);
				if(dist[u.pos][d1^e]>u.d)
				{
					dist[u.pos][d1^e]=u.d;
					pq.push({u.pos,d1,u.d});
				}
			}
		}
		//cout<<"***\n";
		/*for(auto d1:doges1[u.pos])
		{
			if(dist[(u.pos*MAXN+d1)^e]>u.d)
			{
				dist[(u.pos*MAXN+d1)^e]=u.d;
				pq.push({u.pos,d1,u.d});
			}
		}*/
		state v=u;
		if(v.pos+v.p<n)
		{
			v.pos+=v.p;
			if(dist[v.pos][v.p^e]>u.d+1)
			{
				v.d=u.d+1;
				dist[v.pos][v.p^e]=v.d;
				pq.push(v);
			}
		}
		v=u;
		if(v.pos-v.p>=0)
		{
			v.pos-=v.p;
			if(dist[v.pos][v.p^e]>u.d+1)
			{
				v.d=u.d+1;
				dist[v.pos][v.p^e]=v.d;
				pq.push(v);
			}
		}
	}
	if(dist[d[1].pos][d[1].p^e]==INF)
	{
		cout<<-1<<"\n";
	}
	else cout<<dist[d[1].pos][d[1].p^e]<<"\n";
return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 0 / 43