Submission #108267

#	Time	Username	Problem	Language	Result	Execution time	Memory
108267		maksim_gaponov	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1076 ms	3576 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
#define pb push_back

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<int> dist(n, INF);
	queue<int> q;
	q.push(b[0]);
	dist[b[0]] = 0;
	while (!q.empty()) {
		int u = q.front();
		q.pop();
		for (auto x : who[u]) {
			int cnt = 0;
			for (int i = u; i < n; i += p[x]) {
				if (cmin(dist[i], dist[u] + cnt)) {
					q.push(i);
				}
				++cnt;
			}
			cnt = 0;
			for (int i = u; i >= 0; i -= p[x]) {
				if (cmin(dist[i], dist[u] + cnt)) {
					q.push(i);
				}
				++cnt;
			}
		}
	}
	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: 21 / 21
• Subtask 5: 0 / 43