Submission #813437

#	Time	Username	Problem	Language	Result	Execution time	Memory
813437		Juan	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	2 ms	1012 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define pii pair<int,int>
const int maxn = 3e4 + 5, INF = 0x3f3f3f3f;

vector<int> doges[maxn];
int dist[maxn];
priority_queue<pii, vector<pii>, greater<pii>> pq;

int main(){
	int n, m; cin >> n >> m;
	for(int i = 0; i < m; i++){
		int bi, pi; cin >> bi >> pi;
		doges[bi].pb(pi);
	}

	for(int i = 0; i < n; i++) dist[i] = INF;
	pq.push({0,0});
	dist[0] = 0;
	while(pq.size()){
		auto[d,u] = pq.top(); pq.pop();
		if(dist[u]<d) continue;
		if(u==1) break;

		for(int x : doges[u]){
			for(int i = u+x; i < n; i+=x){
				int wv = (i-u)/x;
				if(dist[i] > dist[u]+wv)
					dist[i] = dist[u]+wv, pq.push({dist[i], i});
			}
			for(int i = u-x; i >= 0; i-=x){
				int wv = (u-i)/x;
				if(dist[i] > dist[u]+wv)
					dist[i] = dist[u]+wv, pq.push({dist[i], i});
			}
		}
	}

	if(dist[1] == INF) cout << -1;
	else cout << dist[1];
	cout << '\n';
}

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