Compilare: user.c: In function ‘main’: user.c:47:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~ user.c:49:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:51:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^~~~~~~~~~~~~~~ user.c:55:28: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] for(i = 0; i < n; ++i) scanf("%d", v + i); ^~~~~~~~~~~~~~~~~~ user.c: In function ‘combsort’: user.c:12:20: warning: ‘swapped’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(gap > 1 || swapped) { ^~