Compilare: user.cpp: In function ‘void cit(int&)’: user.cpp:18:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,1000,fila); ^ user.cpp:29:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,1000,fila); ^ user.cpp: In function ‘void cit2(long int&)’: user.cpp:41:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,1000,fila); ^ user.cpp:52:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,1000,fila); ^ user.cpp: In function ‘int main()’: user.cpp:130:32: warning: ‘u2’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<maxi<<" "<<u1<<" "<<u2; ^ user.cpp:130:21: warning: ‘u1’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<maxi<<" "<<u1<<" "<<u2; ^ user.cpp:109:15: warning: ‘rad’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(rad,1); ^