Compilare: user.cpp: In function ‘void befeu()’: user.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:101:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp:107:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp:132:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp:88:10: warning: unused variable ‘arefii’ [-Wunused-variable] bool arefii; ^~~~~~