Submission #1357384

#	Time	Username	Problem	Language	Result	Execution time	Memory
1357384		Desh03	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	22 / 100	13 ms	748 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

const int inf = 1e9;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<int>> v(n);
    set<pair<int, int>> st;
    int u, w;
    for (int i = 0; i < m; i++) {
        int b, p;
        cin >> b >> p;
        if (i == 0) u = b;
        if (i == 1) w = b;
        if (p >= n || st.find({b, p}) != st.end()) continue;
        v[b].push_back(p);
        st.insert({b, p});
    }
    vector<int> d(n, inf), cnt(n);
    d[u] = 0;
    set<int> alive;
    for (int i = 0; i < n; i++) {
        alive.insert(i);
    }
    while (true) {
        int tt = 0;
        vector<int> tr;
        for (int j : alive) {
            if (d[j] == inf) {
                tt++;
                continue;
            }
            bool ok = 1;
            for (int k : v[j]) {
                for (int t = j % k; t < n; t += k) {
                    if (d[t] > d[j] + abs(t - j) / k) {
                        d[t] = d[j] + abs(t - j) / k;
                        ok = 0;
                    }
                }
            }
            if (ok) {
                if (++cnt[j] > 1) {
                    tr.push_back(j);
                    v[j].clear();
                }
                ++tt;
            }
        }
        if (tt == alive.size()) break;
        for (int j : tr) {
            alive.erase(j);
        }
    }
    cout << (d[w] == inf ? -1 : d[w]) << '\n';
    return 0;
}

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