Compilare: user.cpp: In function ‘int getMinK(std::vector<int>*, int)’: user.cpp:49:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(index >= tree->size() || (*tree)[index] > sum) { ^ user.cpp:52:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(index >= tree->size()) { ^ user.cpp:43:20: warning: ‘last_index’ may be used uninitialized in this function [-Wmaybe-uninitialized] int index = 1, last_index; ^