Compilare: main.cpp: In function 'int cupl(int)': main.cpp:21:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while (i < gr[s].size()) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | while (j < lc.size()) { | ~~^~~~~~~~~~~