Compilare: user.c: In function ‘main’: user.c:6:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.in","r",stdin),freopen("next.out","w",stdout),fgets(s,1000005,stdin),scanf("%lld",&d); ^ user.c:6:41: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.in","r",stdin),freopen("next.out","w",stdout),fgets(s,1000005,stdin),scanf("%lld",&d); ^ user.c:6:70: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.in","r",stdin),freopen("next.out","w",stdout),fgets(s,1000005,stdin),scanf("%lld",&d); ^ user.c:6:93: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.in","r",stdin),freopen("next.out","w",stdout),fgets(s,1000005,stdin),scanf("%lld",&d); ^ In file included from /usr/include/stdio.h:934:0, from user.c:1: In function ‘fgets’, inlined from ‘main’ at user.c:6:70: /usr/include/i386-linux-gnu/bits/stdio2.h:253:2: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer [enabled by default] return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^