Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘void dfsx(int)’: user.cpp:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘void dfsy(int)’: user.cpp:87:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘void dfsz(int)’: user.cpp:117:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^