Compilare: user.cpp: In function ‘int main()’: user.cpp:8:24: warning: unused variable ‘nr’ [-Wunused-variable] int n,i,j,m,elim=0,nr=0; ^ user.cpp:36:18: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<lin<<" "<<col<<" "<<m-1<<" "<<elim<<"\n"; ^ user.cpp:36:8: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<lin<<" "<<col<<" "<<m-1<<" "<<elim<<"\n"; ^