Compilare: main.cpp: In function 'int main()': main.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(i = 0; i < s.size(); i++){ | ~~^~~~~~~~~~ main.cpp:20:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | while(i < s.size() and isdigit(s[i])){ | ~~^~~~~~~~~~ main.cpp:30:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | while(i < s.size() and isdigit(s[i])){ | ~~^~~~~~~~~~ main.cpp:50:21: warning: unused variable 'fdas' [-Wunused-variable] 50 | int fdas = num.top(); | ^~~~ main.cpp:60:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(j = 0; j < arr.size(); j++){ | ~~^~~~~~~~~~~~ main.cpp:13:9: warning: unused variable 'n' [-Wunused-variable] 13 | int n, i, j, nr = 0, cnt = 0; | ^