Submission #934966

#	Time	Username	Problem	Language	Result	Execution time	Memory
934966		tamir1	Cyberland (APIO23_cyberland)	C++17	5 / 100	25 ms	11348 KiB

cyberland

#include "cyberland.h"
#include <bits/stdc++.h>
#include <vector>
#define ff first
#define ss second
#define ll long long
#define ld long double
using namespace std;
ld ans1,ans2,path[100010];
vector<pair<ll,ld>> v[100010];
priority_queue<pair<ld,ll>> q;
double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
	if(N==2){
		if(M>0) return c[0];
		else return -1;
	}
	if(N==3){
		bool p=false,q=false;
		ll d;
		for(int i=0;i<M;i++){
			if((x[i]==0 && y[i]==H) || (x[i]==H && y[i]==0)){
				p=true;
				ans1=c[i];
			}
			else if(x[i]==0 || y[i]==0){
				if(x[i]==0) d=y[i];
				else d=x[i];
				if(arr[d]==0) ans2=0;
				else if(arr[d]==1 || (arr[d]==2 && K<1)) ans2=c[i];
				else ans2=(ld)c[i]/2;
				for(int j=0;j<M;j++){
					if((x[j]==d && y[j]==H) || (x[j]==H && y[j]==d)){
						q=true;
						ans2+=c[j];
					}
				}
			}
		}
		if(!p && !q) return -1;
		if(!p) return ans2;
		if(!q) return ans1;
		return min(ans1,ans2);
	}
	for(int i=0;i<N;i++){
		path[i]=(double)-1;
		v[i].clear();
	}
	for(int i=0;i<M;i++){
		v[x[i]].push_back({y[i],(ld)c[i]});
		v[y[i]].push_back({x[i],(ld)c[i]});
	}
	q.push({(ld)0,0});
	while(!q.empty()){
		ld dist=q.top().ff;
		ll a=q.top().ss;
		q.pop();
		if(a==H) return -1*dist;
		if(path[a]!=(ld)-1) continue;
		if(arr[a]==1) path[a]=-1*dist;
		else path[a]=0;
		for(pair<ll,ld> i:v[a]){
			if(path[i.ff]==(ld)-1){
				q.push({-1*path[a]-i.ss,i.ff});
			}
		}
	}
    return -1;
}

• Subtask 1: 5 / 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