Submission #612597

#	Time	Username	Problem	Language	Result	Execution time	Memory
612597		Jomnoi	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1095 ms	87768 KiB

skyscraper

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

const short MAX_N = 30000;

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

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

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

    for(short 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 <short, short>> q;
    q.emplace(B[0], P[0]);
    dist[B[0]][P[0]] = 0;
    while(!q.empty()) {
        short b = q.front().first, p = q.front().second;
        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(short p2 : graph[b]) {
            if(b - p2 >= 0 and !dist[b - p2].count(p2)) {
                dist[b - p2][p2] = dist[b][p] + 1;
                q.emplace(b - p2, p2);
            }
            if(b + p2 < N and !dist[b + p2].count(p2)) {
                dist[b + p2][p2] = dist[b][p] + 1;
                q.emplace(b + p2, p2);
            }
        }
    }
    cout << -1;
    return 0;
}

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