Submission #612589

#	Time	Username	Problem	Language	Result	Execution time	Memory
612589		Jomnoi	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	2 ms	2400 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;

const int MAX_N = 3e4 + 5;
const int INF = 1e9 + 7;

int B[MAX_N], P[MAX_N];
map <int, int> dist[MAX_N];
vector <int> graph[MAX_N];

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int N, M;
    cin >> N >> M;

    for(int i = 0; i < M; i++) {
        cin >> B[i] >> P[i];

        graph[B[i]].push_back(P[i]);
    }

    for(int i = 0; i < N; i++) {
        sort(graph[i].begin(), graph[i].end());
        graph[i].resize(unique(graph[i].begin(), graph[i].end()) - graph[i].begin());
    }

    queue <pair <int, int>> q;
    q.emplace(B[0], P[0]);
    dist[B[0]][P[0]] = 0;
    while(!q.empty()) {
        auto [b, p] = q.front();
        q.pop();

        if(b == B[1]) {
            cout << dist[b][p];
            return 0;
        }
        if(b - p >= 0 and !dist[b - p].count(p)) {
            dist[b - p][p] = dist[b][p] + 1;
            q.emplace(b - p, p);
        }
        if(b + p < N and !dist[b + p].count(p)) {
            dist[b + p][p] = dist[b][p] + 1;
            q.emplace(b + p, p);
        }

        for(auto p2 : graph[b]) {
            if(!dist[b].count(p2)) {
                dist[b][p2] = dist[b][p];
                q.emplace(b, p2);
            }
        }
    }
    cout << -1;
    return 0;
}

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