Compilare: user.cpp: In function ‘void Get(int)’: user.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(index == vec.size() - 1) { ^ user.cpp:52:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i + vec.size() - index - 1 <= unused; ++i) { ^ user.cpp: In function ‘void readData()’: user.cpp:21:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &A, &B); ^