Submission #108294

#	Time	Username	Problem	Language	Result	Execution time	Memory
108294		maksim_gaponov	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	1080 ms	64888 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
#define pb push_back
typedef pair<int, int> pii;
#define all(x) (x).begin(), (x).end()
#define F first
#define S second

const int INF = 1e18;
 
bool cmin(int &a, const int &b) {
	if (a > b) {
		a = b;
		return 1;
	}
	return 0;
}

void run() {
	int n, m;
	cin >> n >> m;
	vector<int> b(m), p(m);
	vector<vector<int>> who(n);
	for (int i = 0; i < m; ++i) {
		cin >> b[i] >> p[i];
		who[b[i]].pb(i);
	}
	vector<vector<pii>> g(n);
	for (int u = 0; u < n; ++u) {
		for (auto x : who[u]) {
			int cnt = 0;
			for (int i = u; i < n; i += p[x]) {
				g[u].pb({i, cnt});
				++cnt;
			}
			cnt = 0;
			for (int i = u; i >= 0; i -= p[x]) {
				g[u].pb({i, cnt});
				++cnt;
			}
			sort(all(g[u]));
			g[u].resize(unique(all(g[u])) - g[u].begin());
		}
	}
	vector<int> dist(n, INF);
	priority_queue<pii> q;
	dist[b[0]] = 0;
	q.push({0, b[0]});
	while (!q.empty()) {
		pii pr = q.top();
		q.pop();
		if (-pr.F != dist[pr.S])
			continue;
		int u = pr.S;
		for (auto edge : g[u]) {
			int v = edge.F;
			int w = edge.S;
			if (cmin(dist[v], dist[u] + w)) {
				q.push({-dist[v], v});
			}
		}
	}
	if (dist[b[1]] >= INF)
		dist[b[1]] = -1;
	cout << dist[b[1]] << '\n';
}

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	run();
}

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