Compilare: main.cpp: In function 'void amestec()': main.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while (index < s.size() && s[index] != ')') | ~~~~~~^~~~~~~~~~ main.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | while (index < s.size() && s[index] == ' ') | ~~~~~~^~~~~~~~~~ main.cpp:34:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (index < s.size() && s[index] != '(') | ~~~~~~^~~~~~~~~~ main.cpp:38:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | else if (index < s.size() && s[index] == '(') | ~~~~~~^~~~~~~~~~ main.cpp:44:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | while (index < s.size() && s[index] == ' ') | ~~~~~~^~~~~~~~~~ main.cpp:49:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | while (index < s.size() && '0' <= s[index] && s[index] <= '9') | ~~~~~~^~~~~~~~~~ main.cpp:58:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | while (index < s.size() && s[index] == ' ') | ~~~~~~^~~~~~~~~~ main.cpp: In function 'void produs()': main.cpp:65:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | while (index < s.size() && s[index] == ' ') | ~~~~~~^~~~~~~~~~ main.cpp:70:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | while (index < s.size() && 'a' <= s[index] && s[index] <= 'z') | ~~~~~~^~~~~~~~~~ main.cpp:76:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 76 | while (index < s.size() && s[index] == ' ') | ~~~~~~^~~~~~~~~~ main.cpp:81:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | while (index < s.size() && '0' <= s[index] && s[index] <= '9') | ~~~~~~^~~~~~~~~~ main.cpp:87:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | while (index < s.size() && s[index] == ' ') | ~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:106:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for (int i = 0; i < sol.size(); ++i) | ~~^~~~~~~~~~~~