Compilare: user.cpp: In function ‘int main()’: user.cpp:15:7: warning: unused variable ‘m’ [-Wunused-variable] int n,m,x,i,j,c=0; ^ user.cpp:15:9: warning: unused variable ‘x’ [-Wunused-variable] int n,m,x,i,j,c=0; ^ user.cpp:15:13: warning: unused variable ‘j’ [-Wunused-variable] int n,m,x,i,j,c=0; ^