Submission #1239684

#	Time	Username	Problem	Language	Result	Execution time	Memory
1239684		AlperenT_	Thousands Islands (IOI22_islands)	C++20	Compilation error	0 ms	0 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>
#include <bits/stdc++.h> 
//#include "segments.h"
#pragma GCC optimize("O3,unroll-loops") 
#pragma GCC target("avx2") 
#define pb push_back
#define F first
#define pii pair<int,int> 
#define all(a) a.begin(),a.end()
#define S second 
#define sz(a) (int)a.size()
#define rep(i , a , b) for(int i = (a) ; i <= (b) ; i++)
#define per(i , a , b) for(int i = (a) ; i >= (b) ; i--)
#define ld double
#define ll long long 
using namespace std ;
const int maxn = 1e6 + 10 , inf = 1e9+ 10 , mod = 998244353;
int mark[maxn] ;
vector <pii> G[maxn] ;
std::variant<bool, std::vector<int>> find_journey(int n, int m, std::vector<int> U, std::vector<int> V) {
  rep(i , 0 ,m-1){
    G[U[i]].pb({V[i] , i}); 
  }
  bool ok =0;
  vector <int> vec ;
  if(sz(G[0]) >= 2)return 1 ;
  if(sz(G[0]) == 0)return 0  ;
  int v =G[v][0].F ;
  mark[0] = 1; 
  while(1){
    int nx = -1;
    mark[v] = 1; 
    for(auto [u,w] : G[V]){
      if(nx!=-1 && mark[u] == 0)return 1 ;
      if(mark[u] == 0)nx = u ;
    }
    v = nx ;
    if(nx == -1)return 0 ;
  } 
  return 1; 
}

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:29:27: error: could not convert '1' from 'int' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   29 |   if(sz(G[0]) >= 2)return 1 ;
      |                           ^
      |                           |
      |                           int
islands.cpp:30:27: error: could not convert '0' from 'int' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   30 |   if(sz(G[0]) == 0)return 0  ;
      |                           ^
      |                           |
      |                           int
islands.cpp:36:23: error: no match for 'operator[]' (operand types are 'std::vector<std::pair<int, int> > [1000010]' and 'std::vector<int>')
   36 |     for(auto [u,w] : G[V]){
      |                       ^
islands.cpp:37:40: error: could not convert '1' from 'int' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   37 |       if(nx!=-1 && mark[u] == 0)return 1 ;
      |                                        ^
      |                                        |
      |                                        int
islands.cpp:41:24: error: could not convert '0' from 'int' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   41 |     if(nx == -1)return 0 ;
      |                        ^
      |                        |
      |                        int
islands.cpp:43:10: error: could not convert '1' from 'int' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   43 |   return 1;
      |          ^
      |          |
      |          int