Submission #582490

#	Time	Username	Problem	Language	Result	Execution time	Memory
582490		YesPy	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	2 ms	1620 KiB

skyscraper

#include <bits/stdc++.h>

#define ff first
#define ss second
#define PHB push_back
#define fastio ios::sync_with_stdio(false);cin.tie(nullptr);
#define ln '\n'
#define nwln cout<<ln;
#define v(T) vector<T>
#define PQ(T) priority_queue<T, v(T), greater<T>>

using namespace std;

typedef pair<int, int> pi;
typedef vector<int> vri;
typedef vector<pi> vpi;
typedef vector<vpi> vvpi;

const int INF = 1001001001;
const int MAXN = 30003;
int N, M;
set<int> B[MAXN];
vri dist;
vvpi adj;

void dijkstra(int src) {
	dist.assign(N, INF);
	dist[src] = 0;

	PQ(pi) pq;
	pq.push({0, src});

	while(!pq.empty()) {
		int v = pq.top().ss, d_v = pq.top().ff;
		pq.pop();

		if(d_v != dist[v]) continue;

		for(pi edge: adj[v]) {
			int w = edge.ss, u = edge.ff;

			if(dist[v] + w < dist[u]) {
				dist[u] = dist[v] + w;
				pq.push({dist[u], u});
			}
		}
	}
}

int main()
{
	fastio
	cin>>N>>M, adj.resize(N);

	while(M--) {
		int b, p;
		cin>>b>>p;
		B[b].insert(p);
	}

	for(int i=0; i<N; ++i) {
		for(int p: B[i]) {
			int pos = i, cost = 0;

			do {
				pos += p, ++cost;
				if(pos >= N) break;
				adj[i].PHB({pos, cost});
			} while(!B[pos].count(p));
		}
	}

	for(int i=0; i<N; ++i) {
		for(int p: B[i]) {
			int pos = i, cost = 0;

			do {
				pos -= p, ++cost;
				if(pos < 0) break;
				adj[i].PHB({pos, cost});
			} while(!B[pos].count(p));
		}
	}

	dijkstra(0);
	cout<<dist[1]<<ln;

	return 0;
}

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