Language: C++

#include <bits/stdc++.h>
#define rep(i, n) for(int i=0; i<(n); ++i)
#define rep2(i, s, n) for(int i=s; i<(n); ++i)
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;

static const int INTINF = (2147483647 >> 1); // 10^9 + 5000
static const ll LLINF = (9223372036854775807 >> 1);
static const int MAX = 1e5+1;
static const ll MOD = 1e9+7;

namespace Printer{
    template<class T>
    void print(T x){
        cout << x << endl;
    }

    template<class T>
    void print(T x, T y){
        cout << x << "," << y << endl;
    }

    template<class T>
    void print(vector<T> v){
        rep(i, v.size()){
            if(i) cout << " ";
            cout<< v[i];
        }
        cout << endl;
    }

    template<class T>
    void print(vector<vector<T> > vv){
        rep(i, vv.size()){
            rep(j, vv[i].size()){
                if(j) cout << " ";
                cout << vv[i][j];
            }
            cout << endl;
        }
    }

    void print(pair<int, int> p){
        cout << "(" << p.first << ", " << p.second << ")" << endl;
    }
};
using namespace Printer;

//--global--//



//----------//

bool check(vector<bool> used){
    bool ok = true;
    rep(i, used.size()){
        if(!used[i]) ok = false;
    }
    return ok;
}

int main(int argc, const char * argv[]) {
    //提出時、消す----//
    //--------------//

    ll n;
    cin >> n;
    vector<pair<ll, ll> > p(n);
    vector<bool> used(n);
    fill(ALL(used), 0);
    rep(i, n){
        ll a, b;
        cin >> a >> b;
        p[i] = make_pair(a, b);
    }

    sort(ALL(p), greater<pair<ll, ll> >());

    ll ans = 0;
    while(!check(used)){
        ans++;
        pair<ll, ll> start = make_pair(INTINF, INTINF);
        vector<double > av;
        double a;
        ll cnt = 0;
        rep(i, n){
            if(!used[n]){
                pair<ll, ll> f = p[i];
                if(start == make_pair(INTINF, INTINF)){
                    start = f;
                    cnt++;
                }
                else{
                    double tmp = (double)(start.second - f.second) / (double)(start.first - f.first);
                    av.push_back(tmp);
                    ll cnttmp = 0;
                    rep(j, av.size()){
                        if(av[j] == tmp){
                            cnttmp++;
                        }
                    }
                    if(cnt < cnttmp+1){
                        a = tmp;
                        cnt = cnttmp + 1;
                    }
                }
            }
        }
        // cout << a << endl;

        start = make_pair(INTINF, INTINF);
        rep(i, n){
            if(!used[i]){
                pair<ll, ll> f = p[i];
                if(start == make_pair(INTINF, INTINF)){
                    start = f;
                    used[i] = true;
                    continue;
                }
                double tmp = (double)(start.second - f.second) / (double)(start.first - f.first);
                if(tmp == a) used[i] = true;
            }
        }
    }

    // cout << "ans" << endl;
    cout << ans << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:93:26: error: no match for 'operator==' (operand types are 'std::pair<long long int, long long int>' and 'std::pair<int, int>')
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                    ~~~~~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~
      |                    |                 |
      |                    |                 pair<int,int>
      |                    pair<long long int,long long int>
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:1199:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:1274:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   deduced conflicting types for parameter '_T1' ('long long int' and 'int')
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
In file included from /usr/include/c++/14/bits/char_traits.h:42,
                 from /usr/include/c++/14/string:42,
                 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/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:93:53: note:   'std::pair<long long int, long long int>' is not derived from 'const std::fpos<_StateT>'
   93 |                 if(start == make_pair(INTINF, INTINF)){
      |                                                     ^
In file included from /usr/include/c++/14/string:43:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const al