Comments
0

The same approach I used during testing but it is wrong.
+3

As a first-fooled person, I suggest everyone participate in this contest.
0

https://cp-algorithms.com/graph/tree_painting.html

You can also refer this blog, small modifications in given code will also work.
0

Yes.
0

The number of elements in the answer is actually 3, but your code gives 2.
0

5

3 4 1 5 4

For this test case, your code gives wrong answer.
+22

Problem C and 923B - Producing Snow are same.
+2

Use Fast IO
+6

https://codeforces.me/problemset/problem/877/D similar problem.