Compilare: user.c: In function ‘main’: user.c:20:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("euler.out", "w", stdout); ^ user.c:22:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.c:24:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &u); ^ user.c:45:31: warning: ‘root’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ((count == 1) && (root == save)) { ^