Submission #695108

#	Time	Username	Problem	Language	Result	Execution time	Memory
695108		Ahmed_Solyman	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	2 ms	1876 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
vector<int>adj[30000],g[30000],b(30000),p(30000);
int main(){
	int n,m;cin>>n>>m;
	for(int i=0;i<m;i++){
		cin>>b[i]>>p[i];
		g[b[i]].push_back(p[i]);
		if(b[i]==b[0]){
			int u=b[i];
			for(int j=b[i]-p[i];j>=0;j-=p[i]){
				adj[u].push_back(j);
				u=j;
			}
			u=b[i];
			for(int j=b[i]+p[i];j<n;j+=p[i]){
				adj[u].push_back(j);
				u=j;
			}
		}
	}
	priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>q;
	q.push({0,b[0]});
	vector<int>dist(n+5,1e9);
	dist[b[0]]=0;
	vector<bool>vis(n+5);
	vis[b[0]]=1;
	map<pair<int,int>,bool>v;
	while(q.size()){
		pair<int,int>x=q.top();
		q.pop();
		dist[x.second]=min(dist[x.second],x.first);
		if(!vis[x.second]){
			vis[x.second]=1;
			for(auto i:g[x.second]){
				int s=x.second;
				int u=x.second+i;

				while(u<n)adj[s].push_back(u),s=u,u+=i;
				s=x.second;
				u=x.second-i;
				while(u>=0)adj[s].push_back(u),s=u,u-=i;
			}
		}
		for(auto i:adj[x.second]){
			if(!v[{x.second,i}]){
				v[{x.second,i}]=1;
				q.push({x.first+1,i});
			}
		}
	}
	cout<<(dist[b[1]]==1e9?dist[b[1]]:-1)<<endl;
}

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