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@lp6m lp6m/1124.cpp
Created Nov 16, 2014

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#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <cmath>
#include <string>
#include <sstream>
#include <iomanip>
#include <complex>
using namespace std;
#define ll long long
#define vvi vector< vector<int> >
#define All(X) X.begin(),X.end()
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define pb push_back
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
int data[200];
int main(){
int n,q;
while(1){
cin >> n >> q;
if(n==0&&q==0) return 0;
REP(i,200) data[i] = 0;
REP(i,n){
int tmp;
cin >> tmp;
REP(j,tmp){
int t2;
cin >> t2;
data[t2]++;
}
}
int ans = 0;
int pnum = 0;
REP(i,200){
if(data[i]>=q){
if(pnum<data[i]){
ans = i;
pnum = data[i];
}
}
}
cout << ans << endl;
}
return 0;
}
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