Compilare: user.cpp: In constructor ‘SegmentTreeTraverser::SegmentTreeTraverser(size_t, SegmentTreeTraverser::Callback, SegmentTreeTraverser::Callback, SegmentTreeTraverser::Callback)’: user.cpp:17:14: warning: ‘SegmentTreeTraverser::m_onLeaf’ will be initialized after [-Wreorder] Callback m_onLeaf; ^ user.cpp:15:14: warning: ‘SegmentTreeTraverser::Callback SegmentTreeTraverser::m_onNodeStart’ [-Wreorder] Callback m_onNodeStart; ^ user.cpp:24:5: warning: when initialized here [-Wreorder] SegmentTreeTraverser(size_t size, ^ user.cpp: In member function ‘void SegmentTreeTraverser::traverse(const std::pair<unsigned int, unsigned int>&, bool)’: user.cpp:52:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (range.second > mid) { ^ user.cpp:55:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (range.first <= mid) { ^ user.cpp: In lambda function: user.cpp:109:13: warning: no return statement in function returning non-void [-Wreturn-type] }); ^ user.cpp: In lambda function: user.cpp:139:13: warning: no return statement in function returning non-void [-Wreturn-type] }, EMPTY, EMPTY); ^ user.cpp: In function ‘int main()’: user.cpp:148:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sequencequery.in", "r", stdin); ^ user.cpp:149:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sequencequery.out", "w", stdout); ^