Compilare: user.c: In function ‘main’: user.c:56:13: warning: unused variable ‘j’ [-Wunused-variable] int t, i, j; ^ user.c:56:10: warning: unused variable ‘i’ [-Wunused-variable] int t, i, j; ^ user.c:57:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^ user.c:59:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^