Compilare: user.c: In function ‘bun’: user.c:92:3: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(aib, 0, sizeof aib); ^ user.c:92:3: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c: In function ‘main’: user.c:110:16: warning: unused variable ‘sum’ [-Wunused-variable] long long k, sum; ^ user.c:109:13: warning: unused variable ‘lg’ [-Wunused-variable] int n, i, lg; ^ user.c: In function ‘readch’: user.c:20:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, BUFF, in); ^