/in/foo.cc: In function 'std::tuple<__int128, __int128, __int128> extended_gcd(i64, i64)':
/in/foo.cc:13:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   13 |     auto [g, x1, y1] = extended_gcd(b, a % b);
      |          ^
/in/foo.cc: In function 'bool particular_solution(i64, i64, i64, i64&, i64&)':
/in/foo.cc:18:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   18 |     auto [g, x, y] = extended_gcd(p, q);
      |          ^
/in/foo.cc: In function 'i64 step_cost(i64, i64, i64, i64, i64, i64, i64, i64)':
/in/foo.cc:31:29: error: call of overloaded 'abs(i64&)' is ambiguous
   31 |     return std::max(std::abs(Cap), std::abs(Cbq)) + std::max(std::abs(Caq), std::abs(Cbp));
      |                     ~~~~~~~~^~~~~
In file included from /usr/include/c++/12/cstdlib:75,
                 from /usr/include/c++/12/ext/string_conversions.h:41,
                 from /usr/include/c++/12/bits/basic_string.h:3960,
                 from /usr/include/c++/12/string:53,
                 from /usr/include/c++/12/bits/locale_classes.h:40,
                 from /usr/include/c++/12/bits/ios_base.h:41,
                 from /usr/include/c++/12/ios:42,
                 from /usr/include/c++/12/ostream:38,
                 from /usr/include/c++/12/iostream:39,
                 from /in/foo.cc:1:
/usr/include/stdlib.h:861:12: note: candidate: 'int abs(int)'
  861 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
In file included from /usr/include/c++/12/cstdlib:77:
/usr/include/c++/12/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/in/foo.cc:31:44: error: call of overloaded 'abs(i64&)' is ambiguous
   31 |     return std::max(std::abs(Cap), std::abs(Cbq)) + std::max(std::abs(Caq), std::abs(Cbp));
      |                                    ~~~~~~~~^~~~~
/usr/include/stdlib.h:861:12: note: candidate: 'int abs(int)'
  861 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/usr/include/c++/12/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/in/foo.cc:31:70: error: call of overloaded 'abs(i64&)' is ambiguous
   31 |     return std::max(std::abs(Cap), std::abs(Cbq)) + std::max(std::abs(Caq), std::abs(Cbp));
      |                                                              ~~~~~~~~^~~~~
/usr/include/stdlib.h:861:12: note: candidate: 'int abs(int)'
  861 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/usr/include/c++/12/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/in/foo.cc:31:85: error: call of overloaded 'abs(i64&)' is ambiguous
   31 |     return std::max(std::abs(Cap), std::abs(Cbq)) + std::max(std::abs(Caq), std::abs(Cbp));
      |                                                                             ~~~~~~~~^~~~~
/usr/include/stdlib.h:861:12: note: candidate: 'int abs(int)'
  861 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/usr/include/c++/12/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/usr/include/c++/12/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/in/foo.cc: In function 'i64 minimal_steps(i64, i64, i64, i64)':
/in/foo.cc:53:18: error: 'gcd' is not a member of 'std'
   53 |     i64 d = std::gcd(p, q);
      |                  ^~~