제출 #68803

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
68803		FedericoS	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	4 ms	1400 KiB

skyscraper

#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <deque>
using namespace std;
typedef pair<int,pair<int,int>> pp;

int N,M;
int B[30005],P[30005];
vector<int> V[30005];
deque<pp> Q;

int main(){

	cin>>N>>M;
	for(int i=0;i<M;i++){
		cin>>B[i]>>P[i];
		if(i)
			V[B[i]].push_back(i);
	}

	//indice distanza posizione

	Q.push_back({0,{0,B[0]}});

	while(!Q.empty()){

		pp p=Q.front();
		Q.pop_front();

		//cout<<Q.size()<<" "<<p.first<<" "<<p.second.first<<" "<<p.second.second<<endl;

		if(p.first==1){
			cout<<p.second.first;
			return 0;
		}

		for(int x:V[p.second.second])
			Q.push_front({x,{p.second.first,B[x]}});
		V[p.second.second].clear();

		if(p.second.second==B[p.first]){

			for(int k=1;;k++){
				if(p.second.second-k*P[p.first]<0)
					break;
				if(!V[p.second.second-k*P[p.first]].empty()){
					Q.push_back({p.first,{p.second.first+k,p.second.second-k*P[p.first]}});
					break;
				}
			}

			for(int k=1;;k++){
				if(p.second.second+k*P[p.first]>=N)
					break;
				if(!V[p.second.second+k*P[p.first]].empty()){
					Q.push_back({p.first,{p.second.first+k,p.second.second+k*P[p.first]}});
					break;
				}
			}			

		}

		if(p.second.second<B[p.first]){
			
			for(int k=1;;k++){
				if(p.second.second-k*P[p.first]<0)
					break;
				if(!V[p.second.second-k*P[p.first]].empty()){
					Q.push_back({p.first,{p.second.first+k,p.second.second-k*P[p.first]}});
					break;
				}
			}

		}

		if(p.second.second>B[p.first]){
			
			for(int k=1;;k++){
				if(p.second.second+k*P[p.first]>=N)
					break;
				if(!V[p.second.second+k*P[p.first]].empty()){
					Q.push_back({p.first,{p.second.first+k,p.second.second+k*P[p.first]}});
					break;
				}
			}	

		}

	}

	cout<<-1;

}

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