Compilare: main.c: In function 'main': main.c:19:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pal.in","r",stdin),freopen("pal.out","w",stdout),scanf("%d",&l); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pal.in","r",stdin),freopen("pal.out","w",stdout),scanf("%d",&l); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("pal.in","r",stdin),freopen("pal.out","w",stdout),scanf("%d",&l); ^~~~~~~~~~~~~~ main.c:21:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",f+i); ^~~~~~~~~~~~~~~ In file included from /usr/include/string.h:635:0, from main.c:2: In function 'memcpy', inlined from 'C.part.0' at main.c:14:13: /usr/include/x86_64-linux-gnu/bits/string3.h:53:10: warning: call to __builtin___memcpy_chk will always overflow destination buffer return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~