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Hi guys, Why my implementation to problem https://codeforces.com/contest/1278/problem/D gives MLE, First I though it is because of recursive DFS. But even after changing DFS to iterative it is still giving MLE. Can anyone please help me with it. My solution links
https://pastebin.com/T5eqyXYS (Recursive)
https://pastebin.com/KczMMcud (Iterative)
It might be because of too large amount of edges in graph. Tree with n vertexes has n-1 edges, so you can check that excession easily.
Thank you Added check for edges and it does the trick
In the worst case, you might end up inserting $$$O(n^2)$$$ edges. So, one idea is to terminate immediately once you find that the no. of edges have become $$$\ge n$$$, since a tree has only $$$(n-1)$$$ edges.
Thank you, yes I forgot that