Submission #797703

#	Time	Username	Problem	Language	Result	Execution time	Memory
797703		XJP12	Thousands Islands (IOI22_islands)	C++17	0 / 100	26 ms	6400 KiB

islands

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
vector<vector<pair<int,int>>> g;
vector<int> recorrido;
vector<int> vis;
bool ya=false;
void dfs(int u, int pist){
	vis[u]=true;
	for(auto vv: g[u]){
		if(!vis[vv.first]){
			if(ya==true) recorrido.push_back(vv.second);
			if(vv.second==pist){
				ya=true;
			}
			dfs(vv.first,pist);
			if(ya==true) recorrido.pop_back();
		}
	}
}
variant<bool,vector<int>> find_journey(int n, int m, vector<int> u, vector<int> v){
	vi check(1001);
	vector<pair<int,int>> p;
	g.assign(n+1,p);
	vis.assign(n+1,0);
	bool ban=false;
	int pistacho=-1;
	for(int i=0; i<m; i++){
		check[u[i]]++;
		if(check[u[i]]>=3){
			ban=true;
			pistacho=min(pistacho,u[i]);
		}
	}
	if(ban==false){
		return false;
	}

	for(int i=0; i<m; i++){
		g[u[i]].push_back({v[i],i});
	}
	if(pistacho!=0){
		dfs(0,pistacho);
	}
	int a=-1,b=-1,c=-1,d=-1;
	int peanut1=-1, peanut2=-1;
	for(int i=0; i<m; i++){
		if(u[i]==pistacho){
			if(peanut1==-1){
				a=i;
				peanut1=v[i];
			}else{
				b=i;
				peanut2=v[i];
				break;
			}
		}
	}
	for(int i=0; i<m; i++){
		if(u[i]==peanut1){
			if(v[i]==0){
				c=i;
				break;
			}
		}
	}
	for(int i=0; i<m; i++){
		if(u[i]==peanut2){
			if(v[i]==0){
				d=i;
				break;
			}
		}
	}
	vector<int> x(8);
	x={a,c,b,d,c,a,d,b};
	for(int i=0; i<8; i++){
     	recorrido.push_back(x[i]);
	}
	return recorrido;
	
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45