Comments

Use Grundy Theorem ( short explanation ) :
Consider a graph, in which from node x you can go to node y then, the grundy function for each node = MEX of the grundy function of child nodes. and the xor of all grundy values determines the winning or losing state.

Can you explain your approach for the problem E ?

Can you share your Approach towards problem D?

Looks like Nobody going to have it :(

Still 502 Bad gateway

Great Explanation