Submission #389627

#	Time	Username	Problem	Language	Result	Execution time	Memory
389627		milleniumEeee	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	1 ms	1248 KiB

skyscraper

#include <bits/stdc++.h>
#define fr first
#define sc second
#define pii pair<int, int>
#define pb push_back
#define szof(s) (int)s.size()
#define all(s) s.begin(), s.end()
#define fastInp ios_base::sync_with_stdio(0); cin.tie(0);
#define int long long
using namespace std;

const int MAXN = 30004;
const int INF = 1e18;

int pos[MAXN], p[MAXN];
vector <pii> g[MAXN];

int n, m;
void create(int pos, int x) {
	for (int i = pos % x; i < n; i += x) {
		if (i != pos) {
			g[pos].pb({abs(pos - i) / x, i});
		}
	}
}

int dist[MAXN];

signed main() {
	fastInp;
	cin >> n >> m;
	for (int i = 0; i < m; i++) {
		cin >> pos[i] >> p[i];
		create(pos[i], p[i]);
	}
	fill(dist, dist + MAXN, -1);
	dist[pos[0]] = 0;
	queue <pii> pq;
	pq.push({0, 0});
	while (!pq.empty()) {
		int v = pq.front().sc;
		int cost = -pq.front().fr;
		pq.pop();
		if (cost > dist[v]) {
			continue;
		}
		for (auto el : g[v]) {
			int c = el.fr, to = el.sc;
			if (dist[to] == -1 || dist[to] > dist[v] + c) {
				dist[to] = dist[v] + c;
				pq.push({-dist[to], to});
			}
		}
	}
	cout << dist[pos[1]] << endl;
}
/*
5 3
0 2
1 1
4 1
*/

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