Compilare: user.cpp: In function ‘int getAdd(int, int)’: user.cpp:76:37: 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:109:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < leaves.size(); ++ i) ^ user.cpp:110:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i; j < leaves.size(); ++ j) ^ user.cpp:123:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int node = 0; node < leaves.size(); ++ node) { ^