Submission #539043

#	Time	Username	Problem	Language	Result	Execution time	Memory
539043		SlavicG	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1095 ms	16020 KiB

skyscraper

#include "bits/stdc++.h"
using namespace std;
 
#define ll long long
 
#define       forn(i,n)              for(int i=0;i<n;i++)
#define          all(v)              v.begin(), v.end()
#define         rall(v)              v.rbegin(),v.rend()
 
#define            pb                push_back
#define          sz(a)               (int)a.size()

const int N = 3e5 + 10;
vector<pair<int, int>> adj[N];
vector<int> dog[N];
void solve() {
    int n, m; cin >> n >> m;
    vector<int> b(m), p(m);
    for(int i = 0;i < m; ++i) {
        cin >> b[i] >> p[i];
        dog[b[i]].pb(i);
    } 
    priority_queue<pair<int,int>> q;

    vector<int> dist(m, INT_MAX);
    dist[0] = 0;
    q.push({0, 0});

    while(!q.empty()) {
        int u = q.top().second;
        q.pop();

        int pp = b[u];
        int jumps = 0;

        for(int v: dog[pp]) {
            if(dist[v] > dist[u] + jumps) {
                dist[v] = dist[u] + jumps;
                q.push({-dist[v], v});
            }
        }

        while(pp + p[u] < n) {
            pp += p[u];
            ++jumps;
            for(int v: dog[pp]) {
                if(dist[v] > dist[u] + jumps) {
                    dist[v] = dist[u] + jumps;
                    q.push({-dist[v], v});
                }
                break;
            }
        }
        pp = b[u], jumps = 0;
        while(pp - p[u] >= 0) {
            pp -= p[u];
            ++jumps;
            for(int v: dog[pp]) {
                if(dist[v] > dist[u] + jumps) {
                    dist[v] = dist[u] + jumps;
                    q.push({-dist[v], v});
                }
                break;
            }
        }
    }

    if(dist[1] == INT_MAX) cout << "-1\n";
    else
    cout << dist[1] << "\n";
}

 
int32_t main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int t = 1;
    //cin >> t;
    while(t--) {
        solve();
    }
}

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