Compilare: user.c: In function ‘main’: user.c:32:27: warning: unused variable ‘err’ [-Wunused-variable] char readbuf[32768], *err; ^ user.c:29:22: warning: unused variable ‘root’ [-Wunused-variable] int is_root[11], root; ^ user.c:29:9: warning: unused variable ‘is_root’ [-Wunused-variable] int is_root[11], root; ^ user.c:28:27: warning: unused variable ‘k’ [-Wunused-variable] int T, i, j, x, y, r, k; ^ user.c:28:24: warning: unused variable ‘r’ [-Wunused-variable] int T, i, j, x, y, r, k; ^ user.c:28:21: warning: unused variable ‘y’ [-Wunused-variable] int T, i, j, x, y, r, k; ^ user.c:28:18: warning: unused variable ‘x’ [-Wunused-variable] int T, i, j, x, y, r, k; ^