Compilare: user.cpp: In function ‘void buildTree(int)’: user.cpp:55:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void buildDown()’: user.cpp:105:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < V[i].size(); j++) ^ user.cpp: In function ‘void Update(int, int)’: user.cpp:179:9: warning: unused variable ‘up’ [-Wunused-variable] int up = Up2[node]; ^