Eroare de compilare: user.cpp: In function ‘bool cmp(std::vector<int, std::allocator<int> >&, std::vector<int, std::allocator<int> >&)’: user.cpp:33: warning: comparison between signed and unsigned integer expressions user.cpp:33: warning: comparison between signed and unsigned integer expressions user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:62: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:64: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:67: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result /tmp/cc1PMX7d.o: In function `solve()': user.cpp:(.text+0x696): undefined reference to `std::tr1::hash<std::vector<int, std::allocator<int> > >::operator()(std::vector<int, std::allocator<int> >) const' user.cpp:(.text+0xa81): undefined reference to `std::tr1::hash<std::vector<int, std::allocator<int> > >::operator()(std::vector<int, std::allocator<int> >) const' collect2: ld returned 1 exit status