Compilare: user.c: In function ‘main’: user.c:29:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.c:31:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d ", &x, &y); ^ user.c:18:14: warning: ‘z’ may be used uninitialized in this function [-Wmaybe-uninitialized] cost[++q]=z; ^ user.c:24:21: note: ‘z’ was declared here int n, i, x, y, z; ^