Submission #821061

#	Time	Username	Problem	Language	Result	Execution time	Memory
821061		PVM_pvm	Marshmallow Molecules (CCO19_day2problem2)	C++17	10 / 25	1520 ms	3412 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define MAXN 5007
bitset<MAXN> gr[MAXN];
int n,m;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>m;
    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:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::size_t' {aka 'long unsigned int'} [-Wsign-compare]
   25 |             if (pos==gr[q].size()) break;
      |                 ~~~^~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 10