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SPOJ Problem Set (classical)
3374. Scavenger Hunt
Problem code: SCAVHUNT
Bill has been the greatest boy scout in America and has become quite a superstar because he
always organized the most wonderful scavenger hunts (you know, where the kids have to find a
certain route following certain hints). Bill has retired now, but a nationwide election quickly found
a successor for him, a guy called George. He does a poor job, though, and wants to learn from
Bill’s routes. Unfortunately Bill has left only a few notes for his successor.
Bill never wrote his routes completely, he only left lots of little sheets on which he had written two
consecutive steps of the routes. He then mixed these sheets and memorized his routes similarly to
how some people learn for exams: practicing again and again, always reading the first step and
trying to remember the following. This made much sense, since one step always required something
from the previous step.
George however would like to have a route written down as one long sequence of all the steps in
the correct order. Please help him make the nation happy again by reconstructing the routes.
The first line contains the number of scenarios. Each scenario describes one route and its first line
tells you how many steps (3 ≤ S ≤ 333) the route has. The next S − 1 lines each contain one
consecutive pair of the steps on the route separated by a single space. The name of each step is
always a single string of letters.
The output for every scenario begins with a line containing “Scenario #i:”, where i is the number
of the scenario starting at 1. Then print S lines containing the steps of the route in correct order.
Terminate the output for the scenario with a blank line.