Submission #847757

#	Time	Username	Problem	Language	Result	Execution time	Memory
847757		KN200711	Cyberland (APIO23_cyberland)	C++17	0 / 100	44 ms	27580 KiB

cyberland

#include "cyberland.h"
# include <bits/stdc++.h>
# define fi first
# define se second
using namespace std;

bool vis[100001];
vector< pair<int, double> > edge[100001];
int h1;

void dfs(int a) {
	vis[a] = 1;
	if(a == h1) return;
	for(auto p : edge[a]) {
		if(!vis[p.fi]) dfs(p.fi);
	}
}

double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
	K = min(K, 70);
	h1 = H;
	for(int i=0;i<N;i++) {
		vis[i] = 0;
		edge[i].clear();
	}
	for(int i=0;i<M;i++) {
		edge[x[i]].push_back(make_pair(y[i], (double) c[i]));
		edge[y[i]].push_back(make_pair(x[i], (double) c[i]));
	}
	dfs(0);
	
	vector< vector<double> > dp;
	dp.resize(K + 1);
	for(int i=0;i<=K;i++) {
		dp[i].resize(N);
		for(int c=0;c<N;c++) dp[i][c] = -1;
	}
	priority_queue< pair<double, pair<int, int> > > PQ;
	for(int d=0;d<N;d++) {
		if(d == 0 || (arr[d] == 0 && vis[d])) PQ.push(make_pair(0, make_pair(0, d)));
	}
	
	while(!PQ.empty()) {
		double a = PQ.top().se.fi;
		int nm = -PQ.top().fi, pos = PQ.top().se.se;
		PQ.pop();
		
		if(dp[nm][pos] != -1) continue;
		dp[nm][pos] = -a;
	//	cout<<pos<<" "<<-nm<<" "<<-a<<endl;
		if(pos == H) break;
		
		for(auto p : edge[pos]) {
			if(arr[p.fi] == 0) continue;
			else if(arr[p.fi] == 1 && dp[nm][p.fi] == -1) PQ.push(make_pair(nm, make_pair((double) a - ((double) p.se), p.fi)));
			else if(arr[p.fi] == 2) {
				if(nm + 1 <= K && dp[nm+1][p.fi] == -1) PQ.push(make_pair(-nm-1, make_pair(((double) a - (double) p.se) / ((double) 2), p.fi)));
				if(dp[nm][p.fi] == -1) PQ.push(make_pair(nm, make_pair(((double) a - (double) p.se), p.fi)));
			} 
		}
	}
	double ans = 1e18;
	for(int v=0;v<=K;v++) {
		if(dp[v][H] != (double) -1) ans = min(ans, dp[v][H]);
	}
	if(ans == 1e18) ans = -1;
	return ans;
}

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