Submission #580802

#	Time	Username	Problem	Language	Result	Execution time	Memory
580802		stevancv	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	701 ms	3784 KiB

skyscraper

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 3e4 + 2;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<int>> g(n);
    int x = -1; int y = -1;
    for (int i = 0; i < m; i++) {
        int b, p;
        cin >> b >> p;
        if (i == 0) x = b;
        if (i == 1) y = b;
        g[b].push_back(p);
    }
    priority_queue<pair<int, int>> q;
    vector<int> dist(n, 1e9);
    vector<bool> was(n);
    q.push({0, x});
    dist[x] = 0;
    while (!q.empty()) {
        int s = q.top().second;
        q.pop();
        if (was[s] == 1) continue;
        was[s] = 1;
        for (int d : g[s]) {
            int tez = 1;
            for (int i = s - d; i >= 0; i -= d) {
                if (dist[i] > dist[s] + tez) {
                    dist[i] = dist[s] + tez;
                    q.push({-dist[i], i});
                }
                tez += 1;
            }
            tez = 1;
            for (int i = s + d; i < n; i += d) {
                if (dist[i] > dist[s] + tez) {
                    dist[i] = dist[s] + tez;
                    q.push({-dist[i], i});
                }
                tez += 1;
            }
        }
    }
    if (dist[y] == 1e9) dist[y] = -1;
    cout << dist[y] << en;
    return 0;
}

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