Compilare: user.cpp: In function ‘int main()’: user.cpp:39:13: warning: unused variable ‘sum’ [-Wunused-variable] int sum=b[n][n]; ^ user.cpp:40:9: warning: unused variable ‘cont’ [-Wunused-variable] int cont=m,lin=n,col=n; ^ user.cpp:40:16: warning: unused variable ‘lin’ [-Wunused-variable] int cont=m,lin=n,col=n; ^ user.cpp:40:22: warning: unused variable ‘col’ [-Wunused-variable] int cont=m,lin=n,col=n; ^