Submission #1083205

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083205		vjudge1	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	33 ms	4568 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
set<int>doge[30100];
int dist[30100],pos[30100];
priority_queue<pair<int,int>,vector<pair<int,int>>,greater<>>pq;
int main(){
    memset(dist,9,sizeof dist);
    int n,m;
    cin>>n>>m;
    for(int i=0;i<m;i++){
        int b;cin>>pos[i]>>b;
        doge[pos[i]].insert(b);
    }
    dist[pos[0]]=0;
    pq.push({0,pos[0]});
    while(pq.size()){
        auto[a,b]=pq.top();
        pq.pop();
        if(dist[b]!=a)continue;
        for(auto d:doge[b]){
            for(int i=b-d;i>=0;i-=d){
                int D=a+(b-i)/d;
                if(dist[i]>D&&doge[i].size())
                    pq.push({dist[i]=D,i});
                if(doge[i].count(d))
                    break;
            }
            for(int i=b+d;i<n;i+=d){
                int D=a+(i-b)/d;
                if(dist[i]>D&&doge[i].size())
                    pq.push({dist[i]=D,i});
                if(doge[i].count(d))
                    break;
            }
        }
    }
    cout<<(dist[pos[1]]!=dist[30099]?dist[pos[1]]:-1);
}

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