Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:31:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v[nod].size(); i++ ) ^ user.cpp: In function ‘int main()’: user.cpp:42:49: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while( s[pos] < 'a' || s[pos] > 'z' && pos < N ) ^ user.cpp:66:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < v[ Order[i] ].size(); j++ ) ^