Submission #821110

#	Time	Username	Problem	Language	Result	Execution time	Memory
821110		PVM_pvm	Marshmallow Molecules (CCO19_day2problem2)	C++17	Compilation error	0 ms	0 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define MAXN 5007
int n,m;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>m;
    bitset<n> gr[n];
    for (int q=0;q<m;q++)
    {
        int a,b;
        cin>>a>>b;
        gr[a][b]=1;
    }
    long long ans=0;
    for (int q=1;q<=n;q++)
    {
        ans+=gr[q].count();
        while(true)
        {
            int pos=gr[q]._Find_first();
            if (pos==gr[q].size()) break;
            gr[q][pos]=0;
            gr[pos]=gr[pos]|gr[q];
        }
    }
    cout<<ans<<"\n";
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:11:13: error: the value of 'n' is not usable in a constant expression
   11 |     bitset<n> gr[n];
      |             ^
Main.cpp:4:5: note: 'int n' is not const
    4 | int n,m;
      |     ^
Main.cpp:11:13: note: in template argument for type 'long unsigned int'
   11 |     bitset<n> gr[n];
      |             ^
Main.cpp:16:14: error: invalid types 'int[int]' for array subscript
   16 |         gr[a][b]=1;
      |              ^
Main.cpp:21:20: error: request for member 'count' in 'gr[q]', which is of non-class type 'int'
   21 |         ans+=gr[q].count();
      |                    ^~~~~
Main.cpp:24:27: error: request for member '_Find_first' in 'gr[q]', which is of non-class type 'int'
   24 |             int pos=gr[q]._Find_first();
      |                           ^~~~~~~~~~~
Main.cpp:25:28: error: request for member 'size' in 'gr[q]', which is of non-class type 'int'
   25 |             if (pos==gr[q].size()) break;
      |                            ^~~~
Main.cpp:26:18: error: invalid types 'int[int]' for array subscript
   26 |             gr[q][pos]=0;
      |                  ^