Compilare: main.cpp: In function 'void euclid(int)': main.cpp:19:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( !Q.empty() && sol.size() <= n) ~~~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:72:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( sol.size() - 1 != n ) ~~~~~~~~~~~~~~~^~~~