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Solution to: Alien Alert

Yes, all individuals can reach the other planet! Consider the following abbreviations for the individuals:

  • F = Federation Officer
  • A = alien that can fly the space ship
  • a = alien that cannot fly the space ship

Then the flight schedule to reach the other planet is the following:

  planet 1          flight          planet 2

  F F F A a a
                  -- A a -->
  F F F a                           A a
                  <-- A ----
  F F F A a                         A a
                  -- A a -->
  F F F                             A a a
                  <-- A ----
  F F F A                           a a
                  -- F F -->
  F A                               F F a a
                  <-- F a --
  F F A a                           F a
                  -- F A -->
  F a                               F F A a
                  <-- F a --
  F F a a                           F A
                  -- F F -->
  a a                               F F F A
                  <-- A ----
  A a a                             F F F
                  -- A a -->
  a                                 F F F A a
                  <-- A ----
  A a                               F F F a
                  -- A a -->
                                    F F F A a a


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