Submission #972403

#	Time	Username	Problem	Language	Result	Execution time	Memory
972403		Halym2007	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	248 ms	262144 KiB

skyscraper

#include "bits/stdc++.h"
#define ll long long int
#define pb push_back
#define pii pair<ll,ll>
#define ff first
#define ss second
#define sz size()

const int N = 3e4 + 5;

using namespace std;

ll n, m, b[N], p[N];

vector <pii> v[N];

priority_queue <pii> pq;

vector <ll> dis(N,1e9);

map <pii,ll> mp;

void f(){
    pq.push({0,b[1]});
    dis[b[1]] = 0;
    while(!pq.empty()){
        int a = pq.top().ss;
        pq.pop();
        for(auto i: v[a]){
            if(dis[a] + i.ss < dis[i.ff]){
                dis[i.ff] = dis[a] + i.ss;
                pq.push({-dis[i.ff],i.ff});
            }
        }
    }
}

int main(){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    //freopen("input.in", "r", stdin);
    //freopen("output.out", "w", stdout);
    cin >> n >> m;
    for(int i = 1; i <= m; i++){
        cin >> b[i] >> p[i];
        mp[{b[i],p[i]}]++;
    }
    for(int i = 1; i <= m; i++){
        ll nd = b[i], cnt = 0;
        while(1){
            nd -= p[i];
            if(nd < 0) break;
            cnt++;
            v[b[i]].pb({nd,cnt});
            if(mp.find({nd,p[i]}) != mp.end()) break;
        }
        nd = b[i], cnt = 0;
        while(1){
            nd += p[i];
            if(nd > n-1) break;
            cnt++;
            v[b[i]].pb({nd,cnt});
            if(mp.find({nd,p[i]}) != mp.end()) break;
        }
        if(mp[{b[i],p[i]}] > 1) mp[{b[i],p[i]}]--;
    }
    f();
    cout << (dis[b[2]] == 1e9 ? -1 : dis[b[2]]);
}

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