Language: C++

#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
int main(){
    int n;
    cin >> n;
    for(int i = 0; i < n; i++){
        float x[2], y[2], r[2];
        
        for(int j = 0; j < 2; j++)
            cin >> x[j] >> y[j] >> r[j];
        
        // 2??????????????????????????¢
        float d = sqrt((x[1]-x[0])*(x[1]-x[0])+(y[1]-y[0])*(y[1]-y[0]));
        float r = r[0] + r[1];
        int ans;
        if(d > r) ans = 0;
        else if(d >= fabs(r[1]-r[0]) && d <= r) ans = 1;
        else{
            if(max(r[0],r[1] == r[0])) ans = 2;
            else ans = -2;
        }
        cout << ans << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:15: error: conflicting declaration 'float r'
   16 |         float r = r[0] + r[1];
      |               ^
a.cc:9:27: note: previous declaration as 'float r [2]'
    9 |         float x[2], y[2], r[2];
      |                           ^
a.cc:18:14: error: invalid operands of types 'float' and 'float [2]' to binary 'operator>'
   18 |         if(d > r) ans = 0;
      |            ~ ^ ~
      |            |   |
      |            |   float [2]
      |            float
a.cc:19:43: error: invalid operands of types 'float' and 'float [2]' to binary 'operator<='
   19 |         else if(d >= fabs(r[1]-r[0]) && d <= r) ans = 1;
      |                                         ~ ^~ ~
      |                                         |    |
      |                                         |    float [2]
      |                                         float
a.cc:21:19: error: no matching function for call to 'max(float&, bool)'
   21 |             if(max(r[0],r[1] == r[0])) ans = 2;
      |                ~~~^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 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:21:19: note:   deduced conflicting types for parameter 'const _Tp' ('float' and 'bool')
   21 |             if(max(r[0],r[1] == r[0])) ans = 2;
      |                ~~~^~~~~~~~~~~~~~~~~~~
/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,
                 from a.cc:2:
/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:21:19: note:   mismatched types 'std::initializer_list<_Tp>' and 'float'
   21 |             if(max(r[0],r[1] == r[0])) ans = 2;
      |                ~~~^~~~~~~~~~~~~~~~~~~