Compilare: user.cpp: In function ‘void back(int, long long int (*)[32][32])’: user.cpp:24:29: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memcpy(r,v[who[x]],sizeof r); ^ user.cpp:30:20: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(r,0,sizeof r); ^ user.cpp:91:25: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the source; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memcpy(v[lst],r,sizeof r); ^ user.cpp: In function ‘int main()’: user.cpp:97:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&n,&k,&m); ^