Submission #896564

#	Time	Username	Problem	Language	Result	Execution time	Memory
896564		Aiperiii	Railway Trip (JOI17_railway_trip)	C++14	5 / 100	2066 ms	12156 KiB

railway_trip

#include <bits/stdc++.h>
#define int long long
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
#define pb push_back
using namespace std;
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);
    int n,k,q;
    cin>>n>>k>>q;
    vector <int> l(n);
    for(int i=0;i<n;i++)cin>>l[i];
    vector <int> g[n];
    for(int i=0;i<n;i++){
        int mx=0;
        for(int j=i+1;j<n;j++){
            if(l[j]>mx){
                mx=l[j];
                g[i].pb(j);
                g[j].pb(i);
            }
            if(mx>=l[i])break;
        }
    }
    while(q--){
        int a,b;
        cin>>a>>b;
        a--;
        b--;
        set <pair <int,int> > st;
        vector <int> d(n,1e18);
        st.insert({0,a});
        d[a]=0;
        while(!st.empty()){
            int v=st.begin()->second;
            st.erase(st.begin());
            for(auto to : g[v]){
                if(d[to]>d[v]+1){
                    st.erase({d[to],to});
                    d[to]=d[v]+1;
                    st.insert({d[to],to});
                }
            }
        }
        int x=d[b]-1;
        cout<<x<<"\n";
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 55