Compilare: user.c: In function ‘manacher’: user.c:8:21: warning: unused variable ‘j’ [-Wunused-variable] int o, r, i, k, j; ^ user.c: In function ‘main’: user.c:30:41: warning: unused variable ‘k’ [-Wunused-variable] int i, j, ans, st, dr, t, B, pos=0, k; ^ user.c:34:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &n); ^ user.c:35:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUF_SIZE, 1, fin); ^