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FTOUR2
1.
FTOUR2 問題概要
N頂点の木構造が与えられる. 辺には重みがついており負もあり得る. M個の頂点は”混雑”している. 2頂点間の経路であって, 混雑した頂点をK回より多く通 らないようにしたときの通る辺の重みの最大値を求め よ。 制約: 1 <= N <= 200000, 0 <= M <= N, 0 <= K <= M.
2.
FTOUR 入出力例のグラフ N
= 8, K = 2, M = 3 1 10 1 3 2 7 5 6 4 8 -2 -1 6 5 3
3.
FTOUR2 解法
Step 1. 木を重心分解(Separator Decomposition, Cen-troid Decomposition)する Step 2. 各重心sを根とした木について, 次のように場合 分けを考えてコストの最大値をとればよい. 1. sを始点とした経路 2. sを通る異なる部分木の頂点間の経路 ※2の処理の際に間違えて同一の部分木内に含まれる頂点 間の経路を含めないようにする.(重心分解の一般的な注 意事項)
4.
FTOUR2 解法
Step 2では重心分解によって分かれた深さlog Nの各層で O(K)で処理できる.他にも怪しい方法でO(K * c), Seg-ment Treeを用いてO(N log K)で処理できる.(ただし TLE?) よって全体の計算量はO(N log N)
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