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發表於 2007-3-2 12:35 AM
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分3組4隻波子秤
6 l: ]* d4 c2 {
5 U; k. b; |% Z; v. NGroup A: 1,2,3,4
+ o0 n6 P3 m/ A1 U2 Y+ e& K8 LGroup B: 5,6,7,8$ q" A q2 ~# {) s
Group C: 9,10,11,12
$ u& P$ c+ V/ I ^0 a" a6 [Group D: 13$ A& Z/ K8 ]2 o% V
6 `3 H* I1 g& P0 V
Round 1
% F' T4 ]; ^: @1 r% M8 s; kGroup A vs Group B: I4 G5 E2 @& c5 l) h
如A and B一樣, 即較輕一粒在Group C or D
6 u7 q! o n/ M; L
/ I( {4 \( T3 n# HRound 2
; m2 J+ w+ d X+ l" }; v3 j; E$ V再在Group C拆成:
7 S$ }" P2 z( S+ u1 J- h1 `Group Ca: 9,104 z0 d/ o. s) C% {
Group Cb: 11,126 `: h2 n. \! c5 n [; r
然後再秤, 如一樣, 即13為較輕一粒.
+ e% B. d7 q7 y' D$ q# i: n* Y: F: s0 T2 U4 ?
如不同, 即較輕一組有一粒較輕波子在其中,
# f, t9 K# J# ~: B' A b& n要再秤, Round 3, 之後便知答案.7 V8 B6 f$ Y) K6 H4 R4 u
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e.g. #1 假設10為較輕的一粒6 U8 D1 U& [: }' p# q5 g( L
Round 1# A8 J9 [! P0 }' R) R
1,2,3,4 vs 5,6,7,8 = equal
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Round 2( ]; r/ w1 d" O% ?# d0 M
9,10 vs 11,12 = 9,10 < 11,12
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0 s/ Y$ G: ~; m! W1 gRound 39 Z. ? F2 i/ Q# J. `( K
9 vs 10 = 9 > 10, d% e8 M0 k( @% S! |- w
* ^; W+ N8 j4 y( X1 ]( mThe answer is 10.: F! z3 c; A# Q
( T3 f- s; n; d4 I, o9 ue.g. #2 假設7為較輕的一粒
3 ~. c5 Z" j1 ]0 `9 u/ m) pRound 18 j8 S/ {# J" H9 b4 m. m
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8! j& K6 T4 W3 `5 \9 W/ _& p1 C4 k
9 H6 a9 a) k- U* Y9 J6 g
Round 2. U1 x/ a3 F# c+ r- ]
5,6 vs 7,8 = 5,6 > 7,8. i8 r7 ~* ?6 F! m
6 A+ w9 v$ B2 D) o; A! x4 o1 SRound 3
% _, Y( Y$ x7 _5 y I" U( ^7 vs 8 = 7 < 8
( z8 n/ u1 b+ h! y+ v) o( {9 |0 X$ x9 D8 {6 M; R
The answer is 7.
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e.g. #3 假設13為較輕的一粒1 `7 U$ M. G3 j$ k' C' u( t. @$ u
Round 1$ X t" P6 S6 |7 m7 H$ |
1,2,3,4 vs 5,6,7,8 = equal
9 L5 U! \7 v: D4 P1 {9 m- U8 [& A) S: X& C/ Z
Round 2
0 T) G2 }0 b0 p8 }9,10 vs 11,12 = equal) H6 h0 r6 `" m' P
. I( {2 {8 [: r' n3 X8 N2 r5 dNo Round 3( o+ _/ E8 v# x5 N, ^: Z- Y+ ^
7 q- j8 \) E( c7 Y; HThe answer is 13.
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唔知我答得正唔正確呢?!  5 D4 O7 J. Z3 c% p
6 @0 B: B& `9 N0 G$ X[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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發表於 2007-3-1 11:57 PM
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