Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  int h,w , n;
  cin >> w >> h >> n;
  vector < tuple double,double,int>> A(n);
  for (int i=0 ; i<n ; i++){
    double a,b,c;
    cin >> a >> b >> c;
    A.at(i) = make_tuple(a,b,c) ;
  }
  int ld_x =0, ld_y = 0 , ru_x = w , ru_y = h;
  for ( int i=0 ; i<n; i++){
    double a,b,c;
    tie(a,b,c) = A.at(i) ;
    if ( c==1){
      ld_x = max(ld_x , a) ;
    }else if ( c==2){
      ru_x = min(ru_x , a) ;
    }else if ( c==3){
      ld_y = max(ld_y , b) ;
    }else if ( c==4){
      ru_y = min(ru_y , b) ;
    }
  }
  double c = (ru_x - ld_x)*(ru_y - ld_y) ;
  cout << (c<=0 ? 0 : c) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:35: error: template argument 1 is invalid
    7 |   vector < tuple double,double,int>> A(n);
      |                                   ^~
a.cc:7:35: error: template argument 2 is invalid
a.cc:11:7: error: request for member 'at' in 'A', which is of non-class type 'int'
   11 |     A.at(i) = make_tuple(a,b,c) ;
      |       ^~
a.cc:16:20: error: request for member 'at' in 'A', which is of non-class type 'int'
   16 |     tie(a,b,c) = A.at(i) ;
      |                    ^~
a.cc:18:17: error: no matching function for call to 'max(int&, double&)'
   18 |       ld_x = max(ld_x , a) ;
      |              ~~~^~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/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:18:17: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'double')
   18 |       ld_x = max(ld_x , a) ;
      |              ~~~^~~~~~~~~~
/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
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:18:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   18 |       ld_x = max(ld_x , a) ;
      |              ~~~^~~~~~~~~~
a.cc:20:17: error: no matching function for call to 'min(int&, double&)'
   20 |       ru_x = min(ru_x , a) ;
      |              ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:20:17: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'double')
   20 |       ru_x = min(ru_x , a) ;
      |              ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:20:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   20 |       ru_x = min(ru_x , a) ;
      |              ~~~^~~~~~~~~~
a.cc:22:17: error: no matching function for call to 'max(int&, double&)'
   22 |       ld_y = max(ld_y , b) ;
      |              ~~~^~~~~~~~~~
/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:22:17: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'double')
   22 |       ld_y = max(ld_y , b) ;
      |              ~~~^~~~~~~~~~
/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<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:22:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   22 |       ld_y = max(ld_y , b) ;
      |              ~~~^~~~~~~~~~
a.cc:24:17: error: no matching function for call to 'min(int&, double&)'
   24 |       ru_y = min(ru_y , b) ;
      |              ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:24:17: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'double')
   24 |       ru_y = min(ru_y , b) ;
      |              ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:24:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   24 |       ru_y = min(ru_y , b) ;
      |              ~~~^~~~~~~~~~