Submission #922277

#	Time	Username	Problem	Language	Result	Execution time	Memory
922277		irmuun	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	838 ms	4068 KiB

skyscraper

#include<bits/stdc++.h>
 
using namespace std;
 
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int n,m;
    cin>>n>>m;
    int b[m],p[m];
    vector<int>adj[n];
    for(int i=0;i<m;i++){
        cin>>b[i]>>p[i];
        adj[b[i]].pb(p[i]);
    }
    set<pair<int,int>>s;
    s.insert({0,b[0]});
    vector<int>d(n,1e9);
    d[b[0]]=0;
    while(!s.empty()){
        pair<int,int>q=*s.begin();
        s.erase(s.begin());
        int C=q.ff,p=q.ss;
        for(int i:adj[p]){
            int cur=p,cost=0;
            while(cur>=0){
                if(C+cost<d[cur]){
                    if(d[cur]<1e9) s.erase({d[cur],cur});
                    d[cur]=C+cost;
                    s.insert({d[cur],cur});
                }
                cur-=i;
                cost++;
            }
            cur=p;
            cost=0;
            while(cur<n){
                if(C+cost<d[cur]){
                    if(d[cur]<1e9) s.erase({d[cur],cur});
                    d[cur]=C+cost;
                    s.insert({d[cur],cur});
                }
                cur+=i;
                cost++;
            }
        }
    }
    if(d[b[1]]==1e9){
        cout<<"-1";
    }
    else{
        cout<<d[b[1]];
    }
}

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