Eroare de compilare: main.cpp: In function 'void evaluate(int)': main.cpp:33:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if (i == expresie.size()) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:38:21: error: reference to 'numbers' is ambiguous 38 | int b = numbers.top(); | ^~~~~~~ In file included from /usr/include/c++/12.2.1/bits/max_size_type.h:37, from /usr/include/c++/12.2.1/bits/ranges_base.h:38, from /usr/include/c++/12.2.1/string_view:50, from /usr/include/c++/12.2.1/bits/basic_string.h:47, from /usr/include/c++/12.2.1/string:53, from /usr/include/c++/12.2.1/bits/locale_classes.h:40, from /usr/include/c++/12.2.1/bits/ios_base.h:41, from /usr/include/c++/12.2.1/ios:42, from /usr/include/c++/12.2.1/ostream:38, from /usr/include/c++/12.2.1/iostream:39, from main.cpp:1: /usr/include/c++/12.2.1/numbers:48:11: note: candidates are: 'namespace std::numbers { }' 48 | namespace numbers | ^~~~~~~ main.cpp:14:12: note: 'std::stack<int> numbers' 14 | stack<int> numbers; | ^~~~~~~ main.cpp:39:13: error: reference to 'numbers' is ambiguous 39 | numbers.pop(); | ^~~~~~~ /usr/include/c++/12.2.1/numbers:48:11: note: candidates are: 'namespace std::numbers { }' 48 | namespace numbers | ^~~~~~~ main.cpp:14:12: note: 'std::stack<int> numbers' 14 | stack<int> numbers; | ^~~~~~~ main.cpp:40:21: error: reference to 'numbers' is ambiguous 40 | int a = numbers.top(); | ^~~~~~~ /usr/include/c++/12.2.1/numbers:48:11: note: candidates are: 'namespace std::numbers { }' 48 | namespace numbers | ^~~~~~~ main.cpp:14:12: note: 'std::stack<int> numbers' 14 | stack<int> numbers; | ^~~~~~~ main.cpp:41:13: error: reference to 'numbers' is ambiguous 41 | numbers.pop(); | ^~~~~~~ /usr/include/c++/12.2.1/numbers:48:11: note: candidates are: 'namespace std::numbers { }' 48 | namespace numbers | ^~~~~~~ main.cpp:14:12: note: 'std::stack<int> numbers' 14 | stack<int> numbers; Non zero exit status: 1