Compilare: user.c: In function ‘main’: user.c:33:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[i ^ (1 << v[k])][(j * 10 + cif[v[k]]) % p] += d[i][j]; ^ user.c:20:24: warning: unused variable ‘vk’ [-Wunused-variable] int i, j, k = 0, ci, vk = 0, nrk; ^ user.c:20:20: warning: variable ‘ci’ set but not used [-Wunused-but-set-variable] int i, j, k = 0, ci, vk = 0, nrk; ^ user.c:12:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%d", &n, &p); ^