Submission #836435

#	Time	Username	Problem	Language	Result	Execution time	Memory
836435		Trumling	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 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;
vector<pair<int,int>> vis;
ll last=-1;
void dfs(int start)
{
  for(auto x:g[start])
  {
    if(vis[x.F].F==-1)
    {
       vis[x.F]={start,x.S};
       dfs(x.F);
       continue;
    }
    
    if((x.F==vis[start].F && x.S!=vis[start].S) || x.F!=vis[start].F)
    {
      last=start;
      break;
    }
  }
    
   return ;
}

variant<bool, vector<int> > find_journey(int N, int M, vector<int> U, vector<int> V) 
{
  g.assign(N,vector<pair<int,int>>());

  for(int i=0;i<M;i+=2)
  {
    g[U[i]].pb({V[i],i});
    g[V[i]].pb({U[i],i});

  }
    
  
    
  

  vis.assign(N,{-1,-1});
  vis[0]={0,-1};

  dfs(0);

  if(last==-1)
  return false;
  
  return 1;
  vector<int>v={0};
  return v;

}

Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:60:10: error: could not convert '1' from 'int' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   60 |   return 1;
      |          ^
      |          |
      |          int