Use __lg to make treeJump shorter
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It breaks the case when P is empty, but thats not an useful case
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I don't care about the case of empty P, because that's not a tree, but I do care about sz(P) == 1. __lg(0) is undefined, right? |
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Oh, yes, I saw in this stack overflow answer that it's -1, and in my machine gives -1, but according to this codeforces blog you are right. |
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It breaks the case when P is empty, but thats not an useful case