Compilare: user.cpp: In function ‘int main()’: user.cpp:13:12: warning: unused variable ‘dz’ [-Wunused-variable] double dz, s, v[30], mat[30][30], sum; ^ user.cpp:13:16: warning: unused variable ‘s’ [-Wunused-variable] double dz, s, v[30], mat[30][30], sum; ^ user.cpp:13:39: warning: unused variable ‘sum’ [-Wunused-variable] double dz, s, v[30], mat[30][30], sum; ^ user.cpp:14:9: warning: unused variable ‘tot’ [-Wunused-variable] int tot, n, k, i, j; ^