HBC15702D. Who killed Cock Robin题解

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由于系统限制,C题无法在此评测,此题为现场赛的D题 Who killed Cock Robin?I, said the Sparrow, With my bow and arrow,I killed Cock Robin. Who saw him die?I, said the Fly.With my little eye,I saw him die. Who caught his blood?I, said the Fish,With my little dish,I caught his blood. Who'll make his shroud?I, said the Beetle,With my thread and needle,I'll make the shroud. ......... All the birds of the air Fell a-sighing and a-sobbing. When they heard the bell toll. For poor Cock Robin. March 26, 2018 Sparrows are a kind of gregarious animals,sometimes the relationship between them can be represented by a tree. The Sparrow is for trial, at next bird assizes,we should select a connected subgraph from the whole tree of sparrows as trial objects. Because the relationship between sparrows is too complex, so we want to leave this problem to you. And your task is to calculate how many different ways can we select a connected subgraph from the whole tree.

由于系统限制,C题无法在此评测,此题为现场赛的D题 Who killed Cock Robin? I, said the Sparrow, With my bow and arrow,I killed Cock Robin. Who saw him die? I, said the Fly.With my little eye,I saw him die. Who caught his blood? I, said the Fish,With my little dish,I caught his blood. Who'll make his shroud? I, said the Beetle,With my thread and needle,I'll make the shroud.     ......... All the birds of the air Fell a-sighing and a-sobbing. When they heard the bell toll. For poor Cock Robin. March 26, 2018 Sparrows are a kind of gregarious animals,sometimes the relationship between them can be represented by a tree. The Sparrow is for trial, at next bird assizes,we should select a connected subgraph from the whole tree of sparrows as trial objects. Because the relationship between sparrows is too complex, so we want to leave this problem to you. And your task is to calculate how many different ways can we select a connected subgraph from the whole tree.

HBC15702D. Who killed Cock Robin题解
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