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River Trip (Posted on 2013-08-26) Difficulty: 3 of 5
Nine Minikins, looking for adventure, decided to float down a nearby river on rafts. Three rafts, identified as #1, #2, and #3, were constructed from bundles of reeds tied with vines. A destination down the river was identified and the three rafts were launched.

One of the rafts, passing under a bridge, was pulled underwater by a troll; the three occupants were able to swim to safety. One raft became waterlogged mid-trip and had to be beached. Only one raft arrived at the predetermined destination.

Based on the following statements, which three Minikins were on which raft and how did each three fare?
  1. Neither Ekum, Elfum, nor Egum was on raft #2, nor were all three on the same raft.
  2. Epum and Edum were on the same raft. It was not the one that became waterlogged.
  3. Evum, whose raft was not pulled underwater by the troll, was not on the same raft as either Egum or Ekum.
  4. Ebum and Ekum were on the same raft. It was not the one that became waterlogged.
  5. Egum was on raft #3 along with Eskum.
  6. Efrum was not on the raft that was pulled underwater by the troll.

See The Solution Submitted by K Sengupta    
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Solution computer solution | Comment 1 of 4

DECLARE SUB place (which!)
CLEAR , , 25000
DIM SHARED troll, wlog, succ, name$, raft$(3), fullname$(9)
DATA Ekum,Elfum,Egum,Epum,Edum,Eskum,Ebum,Efrum,Evum
FOR i = 1 TO 9: READ fullname$(i): NEXT

name$ = "klgpdsbfv"

CLS
FOR troll = 1 TO 3
FOR wlog = 1 TO 3
  IF wlog <> troll THEN
    succ = 6 - wlog - troll
    place 1
  END IF
NEXT
NEXT

SUB place (which)
  n$ = MID$(name$, which, 1)
  FOR b = 1 TO 3
     IF LEN(raft$(b)) < 3 AND (b <> 2 OR n$ <> "k" AND n$ <> "g" AND n$ <> "l") THEN
        raft$(b) = raft$(b) + n$
       
        good = 1
        IF n$ = "g" AND raft$(b) = "kl" THEN good = 0
        IF n$ = "d" AND (INSTR(raft$(b), "p") = 0 OR b = wlog) THEN good = 0
        IF n$ = "v" THEN
          IF b = troll THEN good = 0
          IF INSTR(raft$(b), "g") > 0 OR INSTR(raft$(b), "k") > 0 THEN good = 0
        END IF
        IF n$ = "b" AND INSTR(raft$(b), "k") = 0 THEN good = 0
        IF n$ = "k" AND b = wlog THEN good = 0
        IF (n$ = "g" OR n$ = "s") AND b < 3 THEN good = 0
        IF n$ = "f" AND b = troll THEN good = 0
       
       
        IF good THEN
           IF which = 9 THEN
       
              PRINT "troll", "waterlogged", "success"
              PRINT troll, wlog, succ
              FOR p = 1 TO 3
                PRINT fullname$(INSTR(name$, MID$(raft$(troll), p, 1))),
                PRINT fullname$(INSTR(name$, MID$(raft$(wlog), p, 1))),
                PRINT fullname$(INSTR(name$, MID$(raft$(succ), p, 1)))
              NEXT
             
       
           ELSE
              place which + 1
           END IF
        END IF
       
        raft$(b) = LEFT$(raft$(b), LEN(raft$(b)) - 1)
     END IF
  NEXT b
END SUB

finds (each column has status, raft number and three riders):

troll         waterlogged   success
 1             3             2
Ekum          Egum          Epum
Elfum         Eskum         Edum
Ebum          Efrum         Evum

  Posted by Charlie on 2013-08-26 17:11:39
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