Submission #666187

#	Time	Username	Problem	Language	Result	Execution time	Memory
666187		Kahou	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	387 ms	68168 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define mk make_pair
#define endl '\n'
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const ll inf = 1e18 + 50;
const int N = 2050, M = 30050;
ll n, m, b[M], p[M], dis[N];
ll adj[N][N];
set<pll> st;

void solve() {
	cin >> n >> m;
	for (int x = 0; x < n; x++) {
		dis[x] = inf;
		for (int y = 0; y < n; y++) {
			if (x == y) continue;
			adj[x][y] = inf;
		}
	}

	for (int i = 0; i < m; i++) {
		cin >> b[i] >> p[i];
		for (int x = b[i]%p[i]; x < n; x += p[i]) {
			adj[b[i]][x] = min(adj[b[i]][x], abs(x-b[i])/p[i]);
		}
	}
	dis[b[0]] = 0;
	st.insert({dis[b[0]], b[0]});

	while (st.size()) {
		int u = st.begin()->S;
		st.erase(st.begin());
		
		for (int v = 0; v < n; v++) {
			if (dis[u] + adj[u][v] < dis[v]) {
				st.erase({dis[v], v});
				dis[v] = dis[u] + adj[u][v];
				st.insert({dis[v], v});
			}
		}
	}

	cout << (dis[b[1]] >= inf? -1: dis[b[1]]) << endl;
}
int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	solve();
	return 0;
}

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