Compilare: user.c: In function ‘main’: user.c:83:1: warning: label ‘nextiter’ defined but not used [-Wunused-label] nextiter: ; ^ user.c:29:22: warning: unused variable ‘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; ^