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11375.cpp
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11375.cpp
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#include <bits/stdc++.h>
using namespace std;
#define vt vector
#define ll long long
#define pb push_back
#define pf push_front
#define all(c) (c).begin(), (c).end()
#define rev(c) (c).rbegin(), (c).rend()
#define sz(x) (int)(x).size()
#define vi vector<int>
#define vvi vector<vector<int>>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define en '\n'
#define ioa insert_or_assign
#define umap unordered_map
#define prq priority_queue
#define F first
#define S second
#define F_OR(i, a, b, s) for (int i=(a); (s)>0?i<(b):i>(b); i+=(s))
#define F_OR1(e) F_OR(i, 0, e, 1)
#define F_OR2(i, e) F_OR(i, 0, e, 1)
#define F_OR3(i, b, e) F_OR(i, b, e, 1)
#define F_OR4(i, b, e, s) F_OR(i, b, e, s)
#define GET5(a, b, c, d, e, ...) e
#define F_ORC(...) GET5(__VA_ARGS__, F_OR4, F_OR3, F_OR2, F_OR1)
#define FOR(...) F_ORC(__VA_ARGS__)(__VA_ARGS__)
#define E_ACH2(x, a) for (auto &x : a)
#define E_ACH3(x, y, a) for (auto &[x, y] : a)
#define E_ACH4(x, y, z, a) for (auto &[x, y, z] : a)
#define E_ACHC(...) GET5(__VA_ARGS__, E_ACH4, E_ACH3, E_ACH2)
#define EACH(...) E_ACHC(__VA_ARGS__)(__VA_ARGS__)
string to_string(char c) {
return string(1, c);
}
string to_string(bool b) {
return b?"true":"false";
}
string to_string(const char* s) {
return string(s);
}
string to_string(string s) {
return s;
}
string to_string(vt<bool> v) {
string res;
FOR(sz(v))
res+=char('0'+v[i]);
return res;
}
vector<string> split (const string &s, char delim) {
vector<string> result;
stringstream ss (s);
string item;
while (getline (ss, item, delim)) {
result.push_back (item);
}
return result;
}
vector<string> split (const string &s, string delimiter) {
size_t pos_start = 0, pos_end, delim_len = delimiter.length();
string token;
vector<string> res;
while ((pos_end = s.find (delimiter, pos_start)) != string::npos) {
token = s.substr (pos_start, pos_end - pos_start);
pos_start = pos_end + delim_len;
res.push_back (token);
}
res.push_back (s.substr (pos_start));
return res;
}
const int d4r[4] = {-1,0,1,0}; const int d4c[4] = {0,1,0,-1};
const int d8r[8] = {-1,-1,0,1,1,1,0,-1}; const int d8c[8] = {0,1,1,1,0,-1,-1,-1};
const int INF = 0x3f3f3f3f; const int mINF = 0xc0c0c0c0;
const ll LINF = 0x3f3f3f3f3f3f3f3f; const ll mLINF = 0xc0c0c0c0c0c0c0c0;
int T = 1;
int N,M;
int ans;
vt<int> v[1001];
int d[1001];
bool c[1001];
bool dfs(int x) {
FOR(sz(v[x])) {
int t = v[x][i];
if(c[t]) continue;
c[t] = 1;
if(d[t] == 0 || dfs(d[t])) {
d[t] = x;
return true;
}
}
return false;
}
void sol() {
cin >> N >> M;
int m;
FOR(i,1,N+1) {
cin >> m;
int x;
FOR(j,m) {
cin >> x;
v[i].pb(x);
}
}
FOR(i,1,N+1) {
memset(c,0,sizeof(c));
if(dfs(i)) ans++;
}
cout << ans << en;
return;
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
while(T--) {
sol();
}
return 0;
}