Compilare: main.cpp: In function 'int main()': main.cpp:49:62: warning: narrowing conversion of '(left_.std::vector<_Tp, _Alloc>::size<segment_part, std::allocator<segment_part> >() - 1ul)' from 'std::vector<segment_part>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] left_.push_back(segment_part{-a, c, left_.size() - 1}); ~~~~~~~~~~~~~^~~ main.cpp:52:63: warning: narrowing conversion of '(right_.std::vector<_Tp, _Alloc>::size<segment_part, std::allocator<segment_part> >() - 1ul)' from 'std::vector<segment_part>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] right_.push_back(segment_part{a, c, right_.size() - 1}); ~~~~~~~~~~~~~~^~~