Submission #199572

#	Time	Username	Problem	Language	Result	Execution time	Memory
199572		handlename	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	250 ms	74212 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
int n,m,s,e;
vector<pair<int,int> > adj[30001];
set<int> pos[30001];
int dist[30001];
bool vis[30001];
stack<int> st;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin>>n>>m;
    for (int i=0;i<m;i++){
        int b,p;
        cin>>b>>p;
        if (i==0) s=b;
        if (i==1) e=b;
        pos[p].insert(b);
    }
    for (int i=1;i<30001;i++){
        for (auto j:pos[i]){
            vis[j]=true;
            st.push(j);
        }
        for (auto j:pos[i]){
            int dis=1;
            for (int k=j+i;k<n;k+=i){
                adj[j].pb(mp(k,dis));
                dis++;
                if (vis[k]) break;
            }
            dis=1;
            for (int k=j-i;k>=0;k-=i){
                adj[j].pb(mp(k,dis));
                dis++;
                if (vis[k]) break;
            }
        }
        while (!st.empty()){
            vis[st.top()]=false;
            st.pop();
        }
    }
    for (int i=0;i<n;i++) dist[i]=1e9;
    priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > >pq;
    pq.push(mp(0,s));
    dist[s]=0;
    while (!pq.empty()){
        pair<int,int> cur=pq.top();
        pq.pop();
        if (dist[cur.second]<cur.first) continue;
        for (auto i:adj[cur.second]){
            if (dist[i.first]>cur.first+i.second){
                dist[i.first]=cur.first+i.second;
                pq.push(mp(cur.first+i.second,i.first));
            }
        }
    }
    if (dist[e]==1e9) cout<<-1;
    else cout<<dist[e];
}

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