Submission #392667

#	Time	Username	Problem	Language	Result	Execution time	Memory
392667		arujbansal	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	1 ms	460 KiB

skyscraper

#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <array>
#include <stack>
#include <queue>
#include <random>
#include <numeric>
#include <functional>
#include <chrono>
#include <utility>
#include <iomanip>
#include <assert.h>

using namespace std;

void dbg_out() { cerr << endl; }
template<typename Head, typename... Tail>
void dbg_out(Head H, Tail... T) { cerr << ' ' << H; dbg_out(T...); }
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)

#define rng_init mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define rng_seed(x) mt19937 rng(x)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
// #define int long long

const int MXN = 30001, INF = 1e9 + 5;

void solve() {
    int N, M;
    cin >> N >> M;

    int sq = 1;
    while (sq * sq < N)
        sq++;

    vector<int> powers[N];
    int location[M];

    vector<vector<int>> has(N, vector<int>(sq, 0));

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

        location[i] = B;

        powers[B].push_back(P);

        if (P <= sq)
            has[B][P] = 1;
    }

    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<>> pq;
    vector<int> dist(N + 1, INF);

    dist[location[0]] = 0;
    pq.emplace(0, location[0]);

    while (!pq.empty()) {
        auto [cur_dist, u] = pq.top();
        pq.pop();

        if (dist[u] != cur_dist) continue;

        for (const auto &p : powers[u]) {
            for (int v = u + p, jumps = 1; v < N; v += p, jumps++) {
                int new_dist = cur_dist + jumps;

                if (new_dist < dist[v]) {
                    dist[v] = new_dist;
                    pq.emplace(new_dist, v);
                }

                if (p <= sq && has[v][p]) break;
            }

            for (int v = u - p, jumps = 1; v >= 0; v -= p, jumps++) {
                int new_dist = cur_dist + jumps;
                
                if (new_dist < dist[v]) {
                    dist[v] = new_dist;
                    pq.emplace(new_dist, v);
                }

                if (p <= sq && has[v][p]) break;
            }
        }
    }

    cout << (dist[location[1]] < INF ? dist[location[1]] : -1);
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int TC = 1;
    // cin >> TC;
    while (TC--) solve();
}

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