This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main(){
int n, k, d, a;
cin >> n >> k;
vector<vector<int>> ady(n,vector<int>(n,0));
vector<vector<int>> last(n);
for(int i=0;i<n;i++){
last[i] = {i};
cin >> d;
for(int j=0;j<d;j++){
cin >> a;
ady[min(i,a)][max(i,a)] = 1;
}
}
int cur = 2;
while(cur<=k){
int s = last.size();
vector<vector<int>> nw;
for(int i=0;i<s;i++){
// last[i] --> completed graphs of cur-1 nodes
for(int x=0;x<n;x++){
bool found = true;
for(auto p:last[i]){
if(ady[min(x,p)][max(x,p)]==0){
found = false;
break;
}
}
if(found){
last[i].push_back(x);
nw.push_back(last[i]);
last[i].pop_back();
//for(int kk=0;kk<last[i].size();kk++) cout << last[i][kk] << " ";
//cout << x << endl;
}
}
}
if(nw.size()==0) break;
else{
last = nw;
cur++;
}
}
cout << cur-1 << endl;
}
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