Compilare: main.cpp: In function 'int main()': main.cpp:50:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (i = 0; i < cif.size(); i++) | ~~^~~~~~~~~~~~ main.cpp:56:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for (i = 0; i < cif.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:58:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (j = i + 1; j < cif.size(); j++) | ~~^~~~~~~~~~~~ main.cpp:43:18: warning: unused variable 'cnt1' [-Wunused-variable] 43 | int cer, i, j, cnt1, cnt2; | ^~~~ main.cpp:43:24: warning: unused variable 'cnt2' [-Wunused-variable] 43 | int cer, i, j, cnt1, cnt2; | ^~~~