Compilare: user.cpp: In function ‘void dfs2(int)’: user.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i< ch[node].size() ; i++) ^ user.cpp: In function ‘int InitializeLCA()’: user.cpp:77:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘bool inSubGraph(int, int, int, int)’: user.cpp:92:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ch[lcaDC].size();i++) ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:195:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ch[nod].size();i++) ^ user.cpp: In function ‘int solve(int, int, int)’: user.cpp:189:26: warning: ‘_lca’ may be used uninitialized in this function [-Wmaybe-uninitialized] return ch[_lca].size() != 1; ^