Compilare: user.c: In function ‘main’: user.c:100:10: warning: unused variable ‘val’ [-Wunused-variable] int i, val, pos, dist, max = 0, size = 0; ^ user.c:104:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d", &N, &X, &L); ^ user.c:106:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &dist, &save[i].v); ^