Compilare: main.cpp: In function 'bool vf(int)': main.cpp:13:25: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 13 | if (a[i].size() < lung) | ~~~~~~~~~~~~^~~~~~ main.cpp:25:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int i = lung; i < a[sir].size(); ++i) | ~~^~~~~~~~~~~~~~~