Compilare: user.cpp: In function ‘int getAdd(int, int)’: user.cpp:55:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < leaves.size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:94:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int node = 0; node < leaves.size(); ++ node) ^