Compilare: user.c: In function ‘main’: user.c:6:21: warning: variable ‘tr’ set but not used [-Wunused-but-set-variable] int n, a, b, k, tr, i, v; ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &k, &a, &b); ^ user.c:14:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v); ^