Submission #129158

#	Time	Username	Problem	Language	Result	Execution time	Memory
129158		davitmarg	Political Development (BOI17_politicaldevelopment)	C++17	100 / 100	640 ms	36728 KiB

politicaldevelopment

/*DavitMarg*/
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <stack>
#include <cassert>
#include <iterator>
#include <bitset>
#include <fstream>
#define mod 1000000007ll
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
#define all(v) v.begin(),v.end()
using namespace std;
map<pair<int,int>,bool> edge;
int n,k,used[50004],c[(1<<11)+5],ind[50004],s[50004],f[(1<<11)+5],ans=1;
vector<int> g[50004];
queue<int> q;

int main()
{
	cin>>n>>k;
    for(int i=0;i<n;i++)
	{
        int d,x;
        cin>>d;
        for(int j=0;j<d;j++)
		{
			scanf("%d",&x);
			g[i].PB(x);
			edge[MP(i,x)]=1;
		}
		s[i]=g[i].size();
	}

    for(int i=1;i<(1<<k);i++)
		for(int j=0;j<k;j++)
			if(((1<<j)&i))
			{
				c[i]++;
				f[i]=j;
			}

    for(int i=0;i<n;i++)
        if(s[i]<k)
            q.push(i);

    while(!q.empty())
	{
        int v=q.front();
        q.pop();
        if(used[v])
			continue;
		used[v]=1;
        vector<int> a,mask;
        for(int i=0;i<g[v].size();i++)
		{
			int to=g[v][i];
			if(!used[to])
				a.PB(to);
			s[to]--;
            if(s[to]<k)
				q.push(to);
		}
		mask.resize(a.size(),0);
		for(int i=0;i<a.size();i++)
            ind[a[i]]=i;
		for(int i=0;i<a.size();i++)
			for(int j=0;j<a.size();j++)
			{
				if(i==j || edge.find(MP(a[i],a[j]))==edge.end())
					continue;
				mask[i]+=(1<<j);
			}
        vector<bool> dp((1<<a.size())+10);
        dp[0]=1;
        for(int m=1;m<(1<<a.size());m++)
		{
            int bit=f[m];
            int y=m-(1<<bit);
            if( (mask[bit]&y)==y && dp[y])
			{
				dp[m]=1;
				ans=max(ans,c[m]+1);
			}
		}

	}
	cout<<ans<<endl;
	return 0;
}


/*

4 2
2 1 4
2 0 2
2
2 4 0

*/

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:65:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<g[v].size();i++)
                     ~^~~~~~~~~~~~
politicaldevelopment.cpp:75:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<a.size();i++)
               ~^~~~~~~~~
politicaldevelopment.cpp:77:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<a.size();i++)
               ~^~~~~~~~~
politicaldevelopment.cpp:78:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<a.size();j++)
                ~^~~~~~~~~
politicaldevelopment.cpp:38:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&x);
    ~~~~~^~~~~~~~~

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