Compilare: user.cpp: In function ‘void find(int)’: user.cpp:76:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i=0 ; i<ch[nod].size() ; i++ ){ ^ user.cpp: In function ‘void tree(int, int)’: user.cpp:103:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i=0 ; i<adj[nod].size() ; i++ ) ^ user.cpp:98:8: warning: unused variable ‘p’ [-Wunused-variable] int i,p; ^