public bool Execute()
{
scc.Execute();
var gp = scc.Group;
var len = gp.Length >> 1;
for (int i = 0; i < len; i++)
{
if (gp[i << 1] == gp[(i << 1) | 1])
{
return(false);
}
Answer[i] = gp[i << 1] < gp[(i << 1) | 1];//DAG
}
return(true);
}