Submission #539053

#	Time	Username	Problem	Language	Result	Execution time	Memory
539053		SlavicG	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	22 / 100	20 ms	29524 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];
bool vis[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);
    } 

    vector<int> dist(m, INT_MAX);
    dist[0] = 0;
    vector<int> vec[3 * n + 5];
    vec[0].pb(0);
    for(int f = 0; f <= 3 * n + 4; ++f) {
        while(sz(vec[f])) {
            int u = vec[f].back();
            vec[f].pop_back();
            if(vis[u]) continue;
            vis[u] = true;

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

            for(int v: dog[pp]) {
                if(dist[v] > dist[u] + jumps) {
                    dist[v] = dist[u] + jumps;
                    vec[dist[v]].pb(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;
                        vec[dist[v]].pb(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;
                        vec[dist[v]].pb(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: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43