Submission #1103339

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103339		alexdd	Political Development (BOI17_politicaldevelopment)	C++17	100 / 100	296 ms	28752 KiB

politicaldevelopment

#include <bits/stdc++.h>
using namespace std;
int n,k,mxm;
set<int> con[50005];
set<pair<int,int>> s;
int b[20];
int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>k;
    mxm=1;
    for(int i=1;i<=n;i++)
    {
        int nr,x;
        cin>>nr;
        for(int j=0;j<nr;j++)
        {
            cin>>x;
            x++;
            con[i].insert(x);
        }
        s.insert({nr,i});
    }
    for(int pas=1;pas<=n;pas++)
    {
        auto it = s.begin();
        int nod = (*it).second;
        s.erase(it);

        vector<int> v;
        for(auto j:con[nod])
            v.push_back(j);
        assert((int)v.size() < k);

        for(int config=1;config<(1<<((int)v.size()));config++)
        {
            int cnt=0;
            for(int j=0;j<v.size();j++)
            {
                if((1<<j)&config)
                {
                    b[cnt++]=v[j];
                }
            }
            if(cnt+1>mxm)
            {
                bool bun=1;
                for(int i=0;i<cnt;i++)
                {
                    for(int j=i+1;j<cnt;j++)
                    {
                        if(con[b[i]].find(b[j])==con[b[i]].end())
                        {
                            bun=0;
                            break;
                        }
                    }
                    if(!bun)
                        break;
                }
                if(bun)
                {
                    mxm = cnt+1;
                    if(mxm==k)
                    {
                        cout<<k;
                        return 0;
                    }
                }
            }
        }

        for(auto j:con[nod])
        {
            s.erase({con[j].size(),j});
            con[j].erase(nod);
            s.insert({con[j].size(),j});
        }
    }
    cout<<mxm;
    return 0;
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:38:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |             for(int j=0;j<v.size();j++)
      |                         ~^~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 38 / 38
• Subtask 5: 23 / 23