Compilare: user.cpp: In function ‘void print_heap()’: user.cpp:60:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:108:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec.size();i++) ^ user.cpp:122:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec2.size();i++) ^ user.cpp: In function ‘void heapify(int)’: user.cpp:41:35: warning: ‘maxx_pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] swap(vec[pos],vec[maxx_pos]); ^