Submission #759968

#	Time	Username	Problem	Language	Result	Execution time	Memory
759968		OrazB	Cyberland (APIO23_cyberland)	C++17	100 / 100	1479 ms	73412 KiB

cyberland

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,
             tree_order_statistics_node_update>
    ordered_set;
//set.find_by_order(x) x-position value
//set.order_of_key(x) number of strictly less elements don't need *set.??
#define N 100005
#define wr cout << "Continue debugging\n";
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <double, int>
#define pb push_back
#define ff first
#define ss second

int vis[N];
set<pii> q[N];
vector<pair<int,int>> E[N];
vector<int> z;

void dfs(int nd, int h){
	vis[nd] = 1;
	for (auto i : E[nd]){
		if (i.ff == h or vis[i.ff]) continue;
		dfs(i.ff, h);	
	}
}

double solve(int n, int m, int k, int h, vector<int> x, vector<int> y, vector<int> c, vector<int> arr){
	for (int i = 0; i < max(70,n); i++){
		vis[i] = 0;
		E[i].clear();
		if (i <= 70) q[i].clear();
	}
	for (int i = 0; i < m; i++){
		E[x[i]].pb({y[i], c[i]});
		E[y[i]].pb({x[i], c[i]});	
	}
	z.clear();
	z.pb(0);
	vector<vector<double>> dis(min(73,k+2), vector<double>(n+1, 1e15));	
	dfs(0, h);
	for (int i = 0; i < n; i++) if (!arr[i] and vis[i]) z.pb(i);
	double ans = 1e15;
	for (auto i : z){
		dis[0][i] = 0;
		q[0].insert({0, i});
	}
	for (int i = 0; i <= min(k,70); i++){
		while(!q[i].empty()){
			int x = (*q[i].begin()).ss;
			q[i].erase(q[i].begin());
			if (x == h) continue;
			for (auto j : E[x]){
				double res = dis[i][x]+j.ss;
				if (dis[i][j.ff] > res){
					dis[i][j.ff] = res;
					q[i].insert({dis[i][j.ff], j.ff});
				}
				if (arr[j.ff] == 2){	
					res /= 2;
					if (dis[i+1][j.ff] > res){
						dis[i+1][j.ff] = res;
						q[i+1].insert({dis[i+1][j.ff], j.ff});
					}
				}
			}
		}
		ans = min(ans, dis[i][h]);
	}
	if (ans == 1e15) return double(-1);
	return ans;
}

// int main () 
// {
// 	int n, m, k, h;
// 	cin >> n >> m >> k >> h;
// 	vector<int> x(m), y(m), c(m), arr(n);
// 	for (int i = 0; i < m; i++){
// 		cin >> x[i] >> y[i] >> c[i];
// 	}
// 	for (int i = 0; i < n; i++) cin >> arr[i];
// 	cout << solve(n,m,k,h,x,y,c,arr);
// }	

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