Compilare: user.cpp: In function ‘int main()’: user.cpp:68:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < V[a].size(); j++){ ^ user.cpp:50:9: warning: unused variable ‘x’ [-Wunused-variable] int x,y,poz,nr = 0,a = 1,b = 0; ^ user.cpp:50:11: warning: unused variable ‘y’ [-Wunused-variable] int x,y,poz,nr = 0,a = 1,b = 0; ^ user.cpp:50:13: warning: unused variable ‘poz’ [-Wunused-variable] int x,y,poz,nr = 0,a = 1,b = 0; ^