Compilare: user.cpp: In function ‘int main()’: user.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(n!=sir.size()) ^ user.cpp:56:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q=k+1;q<sir_invers.size();q++) ^ user.cpp:56:13: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int q=k+1;q<sir_invers.size();q++) ^