Compilare: user.cpp: In function ‘int main()’: user.cpp:43:10: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(seen[old_node] == 1) ^~ user.cpp:45:11: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ seen[old_node]=1; ^~~~ user.cpp:46:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int k = 0 ; k < v[old_node].size(); k ++ ) ~~^~~~~~~~~~~~~~~~~~~~