Submission #836162

#	Time	Username	Problem	Language	Result	Execution time	Memory
836162		Trumling	Thousands Islands (IOI22_islands)	C++17	0 / 100	29 ms	4444 KiB

islands

#include "islands.h"
#include <variant>
#include <vector>
#include<bits/stdc++.h>
using namespace std;

#define F first
#define S second
#define all(x) x.begin(),x.end()
typedef long long ll;
#define pb push_back
#define INF 9999999999999999
vector<vector<pair<int,int>>>g;
ll last=-1;
void dfs(int start, vector<int> &vis)
{
  for(auto x:g[start])
    if(x.F==0)
    {
      last=start;
      break;
    }
    else if(vis[x.F]==-1)
    {
       vis[x.F]=start;
       dfs(x.F,vis);
    }
   return ;
}
variant<bool, vector<int> > find_journey(int N, int M, vector<int> U, vector<int> V) 
{
  g.assign(N,vector<pair<int,int>>());
  vector<int>c(N,0);
  for(int i=0;i<M;i+=2)
    g[U[i]].pb({V[i],i});
  
  vector<int>vis(N,-1);
  dfs(0,vis);
  if(last==-1)
  return false;
  
  vector<int>v={0,1,0};
  return v;

}

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