Submission #1202979

#	Time	Username	Problem	Language	Result	Execution time	Memory
1202979		rshohruh	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	0 / 100	1 ms	2376 KiB

skyscraper

// author: rshohruh

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>

#ifdef LOCAL
    #include "debug.hpp"
#else
    #define debug(...) 42
#endif
using namespace std;
#define int long long
#define inf 1e18

const int MXN = 3e4 + 5;

int b[MXN], p[MXN], dist[MXN];
vector<int> g[MXN];
map<int, int> mp[MXN];

// #define with_testcases
void t_main(){
    int n, m; cin >> n >> m;
    for (int i = 0; i < n; i++) dist[i] = inf;
    for (int i = 0; i < m; i++) {
        cin >> b[i] >> p[i];
        g[b[i]].push_back(p[i]);
    }
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;
    dist[b[0]] = 0;
    pq.push({0, b[0]});
    while (!pq.empty()) {
        auto [k, u] = pq.top();
        pq.pop();
        if (dist[u] != inf) continue;
        for (int v : g[u]) {
            // if (mp[v].find(u) != mp[v].end()) continue;
            // mp[v][u];
            for (int i = u - v, t = 1; i >= 0; i -= v, ++t) {
                if (dist[i] > dist[u] + t) {
                    dist[i] = dist[u] + t;
                    pq.push({dist[i], i});
                }
            }
            for (int i = u + v, t = 1; i < n; i += v, ++t) {
                if (dist[i] > dist[u] + t) {
                    dist[i] = dist[u] + t;
                    pq.push({dist[i], i});
                }
            }
        }
    }
    cout << (dist[b[1]] >= inf ? -1 : dist[b[1]]) << '\n';
}

signed main(){
    signed t = 1;
    cin.tie(nullptr)->sync_with_stdio(false);
    #ifdef with_testcases
        cin >> t;
    #endif
    while(t--){
        t_main();
        cout << '\n';
    }
    return 0;
}

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