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WikiCards · Card list · Science cards · Level ancestor problem
Common card · Science
Level ancestor problem, a Common card
In graph theory and theoretical computer science, the level ancestor problem is the problem of preprocessing a given rooted tree T into a data structure that can determine the ancestor of a given node at a given distance from the root of the tree.
- Rarity
- Common
- Domain
- Science
- ATK
- 53
- DEF
- 25
- Power
- 78
- Wikipedia reads a year
- 1,200
Power 78 (ATK + DEF): stronger than 35 % of WikiCards cards.
The facts on the card
The card carries these facts from its Wikipedia article.
- More precisely, let T be a rooted tree with n nodes, and let v be an arbitrary node of T. The level ancestor query LA requests the ancestor of node v at depth d, where the depth of a node v in a tree is the number of edges on the shortest path from the root of the tree to node v.
- It is possible to solve this problem in constant time per query, after a preprocessing algorithm that takes O and that builds a data structure that uses O storage space.
Why it is Common
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Level ancestor problem article was read about 1,200 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 53 and blocks with 25: each hit it takes is cut by 10 %.
How to get Level ancestor problem
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
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- Little Rock National CemeteryCommon · Nature · ATK 47 DEF 31
- Order of the War BannerCommon · History · ATK 50 DEF 28
- OshéCommon · Society · ATK 40 DEF 38
Card lists
- All cards from A to ZEvery card, by name
- Nature cards600 cards
- Science cards600 cards
- History cards599 cards
- Arts cards600 cards
- Society cards600 cards
- Tier listS and A tiers by power (ATK + DEF)
- Legendary cards166 cards
- Epic cards273 cards
- Strongest cardsTop 100 by attack
Credits
Text : Wikipedia, Level ancestor problem (revision), CC BY-SA 4.0. Photo : Vafakhoshaein, CC BY-SA 3.0, Wikimedia Commons.
