Submission #722660

#	Time	Username	Problem	Language	Result	Execution time	Memory
722660		bin9638	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 KiB

islands

#include <bits/stdc++.h>

#ifndef SKY
#include "islands.h"
#endif // SKY

using namespace std;

#define N 100010
#define ll long long
#define fs first
#define sc second
#define ii pair<int,int>
#define pb push_back

int n,m,ktr[N];
vector<int>g[N];

void DFS(int u)
{
    ktr[u]=1;
    for(auto v:g[u])
        if(ktr[v]==0)
            DFS(v);
}

#ifdef SKY
vector<int>
#elif
variant<bool, vector<int>>
#endif // SKY
find_journey(int NNN, int MMM, vector<int> canh_fs, vector<int> canh_sc)
{
    n=NNN;
    m=MMM;
    for(int i=0;i<m;i++)
    {
        int u=canh_fs[i],v=canh_sc[i];
        g[u].pb(v);
        g[v].pb(u);
    }
    if(g[0].size()>=2)
    {
        return
        #ifdef SKY
        {1};
        #elif
        true;
        #endif // SKY
    }
    DFS(0);
    for(int i=1;i<n;i++)
        if(ktr[i]==1&&g[i].size()>=3)
        {
            return
            #ifdef SKY
            {1};
            #elif
            true;
            #endif // SKY
        }
   return
    #ifdef SKY
    {0};
    #elif
    false;
    #endif // SKY
}

#ifdef SKY
int main()
{
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

    return 0;
}
#endif

Compilation message (stderr)

islands.cpp:29:6: error: #elif with no expression
   29 | #elif
      |      ^
islands.cpp:47:14: error: #elif with no expression
   47 |         #elif
      |              ^
islands.cpp:58:18: error: #elif with no expression
   58 |             #elif
      |                  ^
islands.cpp:65:10: error: #elif with no expression
   65 |     #elif
      |          ^
islands.cpp:32:1: error: ISO C++ forbids declaration of 'find_journey' with no type [-fpermissive]
   32 | find_journey(int NNN, int MMM, vector<int> canh_fs, vector<int> canh_sc)
      | ^~~~~~~~~~~~
islands.cpp:32:1: error: ambiguating new declaration of 'int find_journey(int, int, std::vector<int>, std::vector<int>)'
In file included from islands.cpp:4:
islands.h:4:38: note: old declaration 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)'
    4 | std::variant<bool, std::vector<int>> find_journey(
      |                                      ^~~~~~~~~~~~
islands.cpp: In function 'int find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:50:5: error: expected primary-expression before '}' token
   50 |     }
      |     ^
islands.cpp:44:15: error: expected ';' before '}' token
   44 |         return
      |               ^
      |               ;
......
   50 |     }
      |     ~          
islands.cpp:61:9: error: expected primary-expression before '}' token
   61 |         }
      |         ^
islands.cpp:55:19: error: expected ';' before '}' token
   55 |             return
      |                   ^
      |                   ;
......
   61 |         }
      |         ~          
islands.cpp:68:1: error: expected primary-expression before '}' token
   68 | }
      | ^
islands.cpp:62:10: error: expected ';' before '}' token
   62 |    return
      |          ^
      |          ;
......
   68 | }
      | ~