Submission #967104

#	Time	Username	Problem	Language	Result	Execution time	Memory
967104		dubabuba	Cyberland (APIO23_cyberland)	C++17	15 / 100	290 ms	56412 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"
 
using namespace std;
 
typedef double dbl;
typedef long long i64;
typedef vector<int> vi;
typedef pair<int, int> pii;
#define ff first
#define ss second
#define MP make_pair
 
const int mxk = 32;
const int mxn = 1e5 + 10;
vector<pii> adj[mxn];
dbl dis[mxk][mxn];
bool in[mxn];
 
template<typename T> void ono_min(T &MIN, T CMP) { if(MIN > CMP) MIN = CMP; }
template<typename T> void ono_max(T &MAX, T CMP) { if(MAX < CMP) MAX = CMP; }
 
dbl solve(int N, int M, int K, int H, vi x, vi y, vi c, vi arr) {
	for(int i = 0; i < N; i++) {
		in[i] = 0;
		adj[i].clear();
	}
 
	for(int i = 0; i < M; i++) {
		adj[x[i]].push_back(MP(y[i], c[i]));
		adj[y[i]].push_back(MP(x[i], c[i]));
	}

	// for(int i = 0; i < N; i++) {
	// 	cout << i << ":\n";
	// 	for(pii p : adj[i])
	// 		cout << p.ff << ' ' << p.ss << endl;
	// }
 
	priority_queue<pair<dbl, int>> pq[mxk];
	queue<int> q;
	in[0] = 1;
	q.push(0);
 
	for(int i = 0; i < mxk; i++)
	for(int j = 0; j < N; j++)
		dis[i][j] = 1e18;
	pq[0].push(MP(0.0, 0));
	dis[0][0] = 0.0;
 
	while(q.size()) {
		int u = q.front();
		q.pop();
 
		if(arr[u] == 0) {
			pq[0].push(MP(0.0, u));
			dis[0][u] = 0.0;
		}
 
		for(pii p : adj[u]) {
			int v = p.ff;
			if(!in[v]) {
				in[v] = 1;
				q.push(v);
			}
		}
	}

	cout << setprecision(10) << fixed;

	dbl ans = 1e18;
	for(int i = 0; i < mxk && i <= K; i++) {
		bool vis[N];
		memset(vis, 0, sizeof vis);

		while(pq[i].size()) {
			dbl d = -pq[i].top().ff;
			int u = pq[i].top().ss;
			pq[i].pop();

			if(vis[u]) continue;
			if(dis[i][u] < d) exit(1);
			ono_min(dis[i][u], d);
			// cout << u << ' ' << i << ": " << dis[i][u] << ' ' << d << endl;
			vis[u] = 1;
			if(u == H) continue;

			for(pii p : adj[u]) {
				int v = p.ff;
				int c = p.ss;
				if(v == 0 || arr[v] == 0) continue;
				if(!vis[v]) {
					pq[i].push(MP(-(dis[i][u] + c), v));
					ono_min(dis[i][v], dis[i][u] + c);
				}
				if(arr[v] == 2) {
					pq[i + 1].push(MP(-(dis[i][u] + c) / 2.0, v));
					ono_min(dis[i + 1][v], (dis[i][u] + c) / 2.0);
				}
			}
		}
		ono_min(ans, dis[i][H]);
	}
	return (ans < 1e18 ? ans : -1.0);
}

• Subtask 1: 0 / 5
• Subtask 2: 8 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 19
• Subtask 5: 7 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3