Compilare: user.c: In function ‘main’: user.c:56:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &K); ^ user.c:59:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &val[buff++]); ^ user.c:96:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi5.out", "w", stdout); ^ user.c:97:28: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (; last != lim; last = ptr[last]) { ^