Language: C++

//#pragma GCC optimize("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define mp make_pair
#define ff first
#define ss second
#define setbits(x) __builtin_popcount(x)
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ll, int> pli;
typedef pair<db, db> pdd;
typedef vector<int> vi;
#define m1 make_pair
#define in insert
#define pb push_back
#define IOS                           \
    std::ios::sync_with_stdio(false); \
    cin.tie(NULL);                    \
    cout.tie(NULL);
#define endl "\n"
template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

inline ll gcd(ll a, ll b)
{
    if (a == 0)
        return b;
    return gcd(b % a, a);
}
inline ll power(ll a, ll n, ll m)
{
    if (n == 0)
        return 1;
    ll p = power(a, n / 2, m);
    p = (p * p) % m;
    if (n % 2)
        return (p * a) % m;
    else
        return p;
}
const ll MOD = 1000000007;
const int N = int(2e5) + 999;
#define int long long int

int32_t main(){
    IOS;
    
    int n;
    cin>>n;
    vector<pair<int,int>> v(n);
    for(int i=0;i<n;i++){
    	int a;
    	cin>>a;
    	for(int i=0;i<a;i++)
		{
			int x,y;
			cin>>x>>y;
			v[i].pb({x,y});
		}
    }
    int ans =0;
    for(int i=0;i<(1<<n);i++){
    	int flag = 1;
    	int tmp[n]={0};
    	for(int j=0;j<n;j++)
    		tmp[j] = i&(1<<j);

    	for(int i=0;i<n;i++){
    		if(!tmp[i])
    			continue;
    		for(auto it:v[i]){
    			int x = it.ff,y = it.ss;
    			if(tmp[x]!=y)
    				flag = 0;
    		}
    	}
    	if(flag)
    		ans = max(ans,setbits(i));
    }    
    int ans=0;
    
    cout<<ans<<endl;

    return 0;
}

Compiler output:
a.cc: In function 'int32_t main()':
a.cc:24:12: error: '__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, long long int> >, std::pair<long long int, long long int> >::value_type' {aka 'struct std::pair<long long int, long long int>'} has no member named 'push_back'
   24 | #define pb push_back
      |            ^~~~~~~~~
a.cc:67:30: note: in expansion of macro 'pb'
   67 |                         v[i].pb({x,y});
      |                              ^~
a.cc:80:32: error: no matching function for call to 'begin(std::pair<long long int, long long int>&)'
   80 |                 for(auto it:v[i]){
      |                                ^
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:4:
/usr/include/c++/14/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   'std::pair<long long int, long long int>' is not derived from 'std::initializer_list<_Tp>'
   80 |                 for(auto it:v[i]){
      |                                ^
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::pair<long long int, long long int>]':
a.cc:80:22:   required from here
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/bits/range_access.h:52:50: error: 'struct std::pair<long long int, long long int>' has no member named 'begin'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                           ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::pair<long long int, long long int>]':
a.cc:80:22:   required from here
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/bits/range_access.h:63:56: error: 'const struct std::pair<long long int, long long int>' has no member named 'begin'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |                                                 ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   mismatched types '_Tp [_Nm]' and 'std::pair<long long int, long long int>'
   80 |                 for(auto it:v[i]){
      |                                ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1227:5: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
 1227 |     begin(valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1227:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   'std::pair<long long int, long long int>' is not derived from 'std::valarray<_Tp>'
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/valarray:1238:5: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
 1238 |     begin(const valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1238:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   'std::pair<long long int, long long int>' is not derived from 'const std::valarray<_Tp>'
   80 |                 for(auto it:v[i]){
      |                                ^
a.cc:80:32: error: no matching function for call to 'end(std::pair<long long int, long long int>&)'
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   'std::pair<long long int, long long int>' is not derived from 'std::initializer_list<_Tp>'
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&) [with _Container = std::pair<long long int, long long int>]':
a.cc:80:22:   required from here
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/bits/range_access.h:74:48: error: 'struct std::pair<long long int, long long int>' has no member named 'end'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |                                         ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&) [with _Container = std::pair<long long int, long long int>]':
a.cc:80:22:   required from here
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/bits/range_access.h:85:54: error: 'const struct std::pair<long long int, long long int>' has no member named 'end'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |                                               ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   mismatched types '_Tp [_Nm]' and 'std::pair<long long int, long long int>'
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   'std::pair<long long int, long long int>' is not derived from 'std::valarray<_Tp>'
   80 |                 for(auto it:v[i]){
      |                                ^
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   template argument deduction/substitution failed:
a.cc:80:32: note:   'std::pair<long long int, long long int>' is not derived from 'const std::valarray<_Tp>'
   80 |                 for(auto it:v[i]){
      |                                ^
a.cc:82:36: error: 'y' was not declared in this scope
   82 |                         if(tmp[x]!=y)
      |                                    ^
a.cc:87:26: error: no matching function for call to 'max(long long int&, int)'
   87 |                 ans = max(ans,setbits(i));
      |                       ~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:87:26: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   87 |                 ans = max(ans,setbits(i));
      |                       ~~~^~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<