Submission #162420

#	Time	Username	Problem	Language	Result	Execution time	Memory
162420		MvC	Political Development (BOI17_politicaldevelopment)	C++11	54 / 100	2806 ms	8236 KiB

politicaldevelopment

#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=5e3+5;
const int mod=1e9+7;
using namespace std;
int n,k,x,i,j,d[nmax],nr,rs;
bitset<nmax>b[nmax],viz;
vector<int>g[nmax],vc,rnd;
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	srand(time(0));
	cin>>n>>k;
	for(i=1;i<=n;i++)
	{
		cin>>d[i];
		for(j=1;j<=d[i];j++)
		{
			cin>>x;
			x++;
			b[i][x]=1;
			g[i].pb(x);
		}
	}
	for(i=1;i<=n;i++)rnd.pb(i);
	while(clock()/(double)CLOCKS_PER_SEC<=2.8)
	{
		random_shuffle(rnd.begin(),rnd.end());
		for(int i=0;i<(int)vc.size();i++)viz[vc[i]]=0;
		vc.clear();
		for(i=0;i<n;i++)
		{
			x=rnd[i];
			nr=0;
			for(j=0;j<(int)g[x].size();j++)nr+=viz[g[x][j]];
			if(nr==(int)vc.size())
			{
				vc.pb(x);
				viz[x]=1;
			}
		}
		rs=max(rs,(int)vc.size());
		if(rs==k)break;
	}
	cout<<rs<<endl;
	return 0;
}

Compilation message (stderr)

politicaldevelopment.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("O3")
 
politicaldevelopment.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("unroll-loops")

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 38 / 38
• Subtask 5: 0 / 23