HBC24874爱丽丝的人偶（一）,思维[USACO 2009 Ope B]Treasure Cave题解

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Bessie's grandfather was a pirate who accumulated a great treasure chest of golden plunder. He hid the treasure chest in a cave that Bessie has recently discovered right on Farmer John's land!Just inside the cave's entrance she found a map that told her how to get the treasure.

Bessie's grandfather was a pirate who accumulated a great treasure chest of golden plunder. He hid the treasure chest in a cave that Bessie has recently discovered right on Farmer John's land! Just inside the cave's entrance she found a map that told her how to get the treasure. The cave has P passages (3 <= P <= 5,000) conveniently numbered 1..P. The entrance is passage 1; the treasure is located in some reachable passage T (2 <= T <= P), whose value is supplied. Passages are all approximately the same length; each one leads to a split where hitherto unexplored numbered passages take the inquisitive cow deeper underground. No passage appears as the split from more than one passage, and the map contains a total of NS splits (1 <= NS <= 5,000). Bessie wants to know both how far away from the entrance the treasure lies and also which passage numbers to take to get to the treasure. Consider the schematic representation of a cave shown below. Passage numbers are shown close to the passage they name. For this example, the treasure is at the end of passage number 7: 3/ / + / /5 2/ 4 / 1 / + ----+ 6 #7 /11 / / 13 + + 8 10/ / 12 + 9 Bessie would have to traverse passages 1, 2, 4, 6, and 7 to get to the treasure, a total distance of 5 (which is simply the passage count). The input file includes a set of lines, each with a passage number N (1 <= N <= P) and the two passages (B1 and B2; 1 <= B1 <= P; 1 <= B2 <= P) that branch off from it. Some line in the input file will include passage number 1 and its two branches (for our example, passages 2 and 13; likewise, passage number 8 has two branches: 9 and 10). Tell Bessie how to get to the treasure.

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标签： HBC24874爱丽丝的人偶（一） 思维[USACO 2009 Ope B]Treasure Cave题解