Please give me any hint or solution for this problem.
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Please give me any hint or solution for this problem.
Name |
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If vertex p is the parent of v and (h[v]-h[p]) = (s[v]-s[p]), it means that all edges from p to v directed from p to v.
If vertex p is the parent of v and (h[v]-h[p]) = -(s[v]-s[p]), it means that all edges from p to v directed from v to p.
For every query (a,b):
Sorry for my english.