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Editorial of Code Festival 2014 Morning Challenge (あさぷろ) Hard D
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Rail tour
1.
Rail Tour @pepsin_amylase
: 原案, テスト @kawatea : テスト 1
2.
問題 線分上でだけv 倍早く動ける最短経路
2 S G
3.
問題 線分上でだけv 倍早く動ける最短経路
3 S G
4.
最短経路として曲線はない • 曲線の区間はすべて鉄道上でない
• 鉄道は直線なので • すると曲線よりも直線のほうが必ず速い 4
5.
最短経路の経由点は? • 最短経路は折れ線になる(曲線なし)
• 折れ曲りうる経由点を洗い出して 最短経路に帰着したい • 始点終点と鉄道の折れてる点は使いそう • 鉄道に沿うルートが最短の時など • これを駅と呼ぶことにします • ほかは? 5
6.
最短経路の経由点は? • 場合分けして考えます
6 駅 駅を除く 線路上 それ以外 駅○ ① ③ 駅を除く 線路上① ② ③ それ以外③ ③ ③
7.
③どうでもいい点を途中で経由 • 以下のルートが最短経路だったとする
7 駅でも線分上でもない点
8.
③どうでもいい点を途中で経由 • 点の取り方から、ルートは鉄道でない
8 駅でも線分上でもない点 鉄道でない鉄道でない
9.
③どうでもいい点を途中で経由 • 赤のルートがより速いので矛盾
9 駅でも線分上でもない点 鉄道でない鉄道でない
10.
最短経路の経由点は? • 場合分けして考えます
10 駅 駅を除く 線路上 それ以外 駅○ ① × 駅を除く 線路上① ② × それ以外× × ×
11.
②線路上から線路上 • 次のような設定で
所要時間をx, y で微分して頑張ると 極値は定義域の境界上= 駅のみに 限られることがわかる • x, y の定義域に注意 11 θ s t x y
12.
最短経路の経由点は? • 場合分けして考えます
12 駅 駅を除く 線路上 それ以外 駅○ ① × 駅を除く 線路上① × × それ以外× × ×
13.
①駅から線路上 • 次のような設定で
所要時間をx について微分すると 入射角が一定になることがわかる 13 s x t
14.
①駅から線路上 • 三分探索してもOK
です 14
15.
まとめ • 次の頂点でグラフを作り最短経路
• 駅 • 駅から線路に入射角acos(1/v) の 直線を引いた交点 15
16.
注意点 • 辺のコストに注意
• 同じ線分に載っている頂点に限り 速度v になる • グラフの作り方に注意 • 頂点数は最大O(n2) になるので、 全部に辺を張るとTLE • 駅でない点同士で結ぶ必要はない • 三角不等式を考えればOK 16
17.
情報 • Judge
Solutions • amylase (C++) : 141 lines • kawatea (C++) : 243 lines 17
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