Compilare: main.cpp: In function 'int main()': main.cpp:47:34: warning: comparison of integer expressions of different signedness: 'std::vector<group>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 47 | while (groups.size() > which) { | ~~~~~~~~~~~~~~^~~~~~~ main.cpp:60:34: warning: comparison of integer expressions of different signedness: 'std::vector<group>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 60 | while (groups.size() > which) { | ~~~~~~~~~~~~~~^~~~~~~