Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:183:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:201:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp:214:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp:220:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp:196:9: warning: unused variable ‘left’ [-Wunused-variable] int left = Left[node], right = Right[node]; ^ user.cpp:196:28: warning: unused variable ‘right’ [-Wunused-variable] int left = Left[node], right = Right[node]; ^