Compilare: user.cpp: In function ‘void dfs1(int, int)’: user.cpp:12:33: 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, int)’: user.cpp:21:24: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] for(int i=g[node][i]-1; i>=0; i--) ^