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lunes, mayo 22, 2006

Solución del acertijo.

No sigáis leyendo si no conocéis mi post anterior: "Me gusta contaminar el planeta !" e intentad resolver el acertijo !

Antes que nada os daré una pista. Normalmente para averiguar el tipo de una sucesión se hace las restas sucesivas entre los numeres, y si esto no dice nada se hace las restas del resultado. Si la primera linea de numeres es constante quiere decir que es una sucesión lineal, y si es constante la segunda es una progresión cuadrática. Por ejemplo:

4     7     12    19    28    39    52    67    84   103   124
 \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /
  3     5     7     9     11    13    15    17    19    21
    \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /
     2     2     2     2     2     2     2     2     2

es una sucesión cuadrática.

Ya sabéis como lo hice, podéis volver a intentar resolverlo, y si no os sale continuad leyendo.

Mi sucesión la hice de manera que la cuarta linea de restas es una copia de la primera:

0     1     2     3     5     10    21    43    86   171   341   682  1365  2731  5462
  \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /
   1     1     1     2     5     11    22    43    85   170   341   683  1366  2731
     \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /
      0     0     1     3     6     11    21    42    85   171   342   683  1365
        \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /   \ /
         0     1     2     3     5     10    21    43    86   171   341   682

Bueno, como ya lo sabéis todo intentad sacar los primeros 1000 numeres. Mi solución viene a continuación.

El algoritmo es muy fácil:
0     1     2
  \ /   \ /
   1     1
     \ /
      0


0     1     2   
| \ /   \ /
|  1     1
|    \ /
|     0
|       \ 
+------> 0
0     1     2
 \ /   \ /
  1     1
    \ /
     0     0
       \ /
        0
0     1     2
  \ /   \ /
   1     1     1
     \ /   \ /
      0     0
        \ /
         0
0     1     2     3
 \ /   \ /   \ /
  1     1     1
    \ /   \ /
     0     0
       \ /
        0
0     1     2     3
 \ /   \ /   \ /
  1     1     1
    \ /   \ /
     0     0
       \ /   \ 
        0     1

Comienza con un triángulo pequeño, copiamos el primer numero y vamos haciendo sumas. Después se repite el proceso.

Escrito en PERL seria:
#!/usr/bin/perl
#
use strict;
use warnings;

my @suc = (0, 1, 2);
my $a = 2;
my $b = 1;
my $c = 0;

for ( my $i = 0; $i < 998; $i++ ) {
       my $d = $suc[$i];
       $c += $d;
       $b += $c;
       $a += $b;
       push @suc, $a;
}

$" = ", ";
print "@suc\n";
Donde:
  • @suc es la sucesión resultante
  • $a es el ultimo valor de la primera linea
  • $b es el ultimo valor de la segunda linea
  • $b es el ultimo valor de la tercera linea
  • $d es el valor actual de la cuarta fila (la que se repite)

Y el resultado de la ejecución del script es (como es muy largo los 900 numeres restantes están ocultos):

0, 1, 2, 3, 5, 10, 21, 43, 86, 171, 341, 682, 1365, 2731, 5462, 10923, 21845, 43690, 87381, 174763, 349526, 699051, 1398101, 2796202, 5592405, 11184811, 22369622, 44739243, 89478485, 178956970, 357913941, 715827883, 1431655766, 2863311531, 5726623061, 11453246122, 22906492245, 45812984491, 91625968982, 183251937963, 366503875925, 733007751850, 1466015503701, 2932031007403, 5864062014806, 11728124029611, 23456248059221, 46912496118442, 93824992236885, 187649984473771, 375299968947542, 750599937895083, 1.50119987579016e+15, 3.00239975158033e+15, 6.00479950316066e+15, 1.20095990063213e+16, 2.40191980126426e+16, 4.80383960252853e+16, 9.60767920505706e+16, 1.92153584101141e+17, 3.84307168202282e+17, 7.68614336404565e+17, 1.53722867280913e+18, 3.07445734561826e+18, 6.14891469123652e+18, 1.2297829382473e+19, 2.45956587649461e+19, 4.91913175298921e+19, 9.83826350597843e+19, 1.96765270119569e+20, 3.93530540239137e+20, 7.87061080478274e+20, 1.57412216095655e+21, 3.1482443219131e+21, 6.29648864382619e+21, 1.25929772876524e+22, 2.51859545753048e+22, 5.03719091506096e+22, 1.00743818301219e+23, 2.01487636602438e+23, 4.02975273204876e+23, 8.05950546409753e+23, 1.61190109281951e+24, 3.22380218563901e+24, 6.44760437127802e+24, 1.2895208742556e+25, 2.57904174851121e+25, 5.15808349702242e+25, 1.03161669940448e+26, 2.06323339880897e+26, 4.12646679761793e+26, 8.25293359523587e+26, 1.65058671904717e+27, 3.30117343809435e+27, 6.6023468761887e+27, 1.32046937523774e+28, 2.64093875047548e+28, 5.28187750095096e+28, 1.05637550019019e+29, 2.11275100038038e+29, 4.22550200076077e+29, 8.45100400152153e+29, 1.69020080030431e+30,
[CONTINUA]
3.38040160060861e+30, 6.76080320121722e+30, 1.35216064024344e+31, 2.70432128048689e+31, 5.40864256097378e+31, 1.08172851219476e+32, 2.16345702438951e+32, 4.32691404877902e+32, 8.65382809755805e+32, 1.73076561951161e+33, 3.46153123902322e+33, 6.92306247804644e+33, 1.38461249560929e+34, 2.76922499121858e+34, 5.53844998243715e+34, 1.10768999648743e+35, 2.21537999297486e+35, 4.43075998594972e+35, 8.86151997189944e+35, 1.77230399437989e+36, 3.54460798875978e+36, 7.08921597751955e+36, 1.41784319550391e+37, 2.83568639100782e+37, 5.67137278201564e+37, 1.13427455640313e+38, 2.26854911280626e+38, 4.53709822561251e+38, 9.07419645122503e+38, 1.81483929024501e+39, 3.62967858049001e+39, 7.25935716098002e+39, 1.451871432196e+40, 2.90374286439201e+40, 5.80748572878402e+40, 1.1614971457568e+41, 2.32299429151361e+41, 4.64598858302721e+41, 9.29197716605443e+41, 1.85839543321089e+42, 3.71679086642177e+42, 7.43358173284354e+42, 1.48671634656871e+43, 2.97343269313742e+43, 5.94686538627483e+43, 1.18937307725497e+44, 2.37874615450993e+44, 4.75749230901987e+44, 9.51498461803973e+44, 1.90299692360795e+45, 3.80599384721589e+45, 7.61198769443179e+45, 1.52239753888636e+46, 3.04479507777271e+46, 6.08959015554543e+46, 1.21791803110909e+47, 2.43583606221817e+47, 4.87167212443634e+47, 9.74334424887269e+47, 1.94866884977454e+48, 3.89733769954907e+48, 7.79467539909815e+48, 1.55893507981963e+49, 3.11787015963926e+49, 6.23574031927852e+49, 1.2471480638557e+50, 2.49429612771141e+50, 4.98859225542282e+50, 9.97718451084563e+50, 1.99543690216913e+51, 3.99087380433825e+51, 7.98174760867651e+51, 1.5963495217353e+52, 3.1926990434706e+52, 6.3853980869412e+52, 1.27707961738824e+53, 2.55415923477648e+53, 5.10831846955296e+53, 1.02166369391059e+54, 2.04332738782119e+54, 4.08665477564237e+54, 8.17330955128474e+54, 1.63466191025695e+55, 3.2693238205139e+55, 6.53864764102779e+55, 1.30772952820556e+56, 2.61545905641112e+56, 5.23091811282223e+56, 1.04618362256445e+57, 2.09236724512889e+57, 4.18473449025779e+57, 8.36946898051558e+57, 1.67389379610312e+58, 3.34778759220623e+58, 6.69557518441246e+58, 1.33911503688249e+59, 2.67823007376498e+59, 5.35646014752997e+59, 1.07129202950599e+60, 2.14258405901199e+60, 4.28516811802397e+60, 8.57033623604795e+60, 1.71406724720959e+61, 3.42813449441918e+61, 6.85626898883836e+61, 1.37125379776767e+62, 2.74250759553534e+62, 5.48501519107069e+62, 1.09700303821414e+63, 2.19400607642827e+63, 4.38801215285655e+63, 8.7760243057131e+63, 1.75520486114262e+64, 3.51040972228524e+64, 7.02081944457048e+64, 1.4041638889141e+65, 2.80832777782819e+65, 5.61665555565638e+65, 1.12333111113128e+66, 2.24666222226255e+66, 4.49332444452511e+66, 8.98664888905021e+66, 1.79732977781004e+67, 3.59465955562009e+67, 7.18931911124017e+67, 1.43786382224803e+68, 2.87572764449607e+68, 5.75145528899214e+68, 1.15029105779843e+69, 2.30058211559685e+69, 4.60116423119371e+69, 9.20232846238742e+69, 1.84046569247748e+70, 3.68093138495497e+70, 7.36186276990994e+70, 1.47237255398199e+71, 2.94474510796397e+71, 5.88949021592795e+71, 1.17789804318559e+72, 2.35579608637118e+72, 4.71159217274236e+72, 9.42318434548472e+72, 1.88463686909694e+73, 3.76927373819389e+73, 7.53854747638777e+73, 1.50770949527755e+74, 3.01541899055511e+74, 6.03083798111022e+74, 1.20616759622204e+75, 2.41233519244409e+75, 4.82467038488818e+75, 9.64934076977635e+75, 1.92986815395527e+76, 3.85973630791054e+76, 7.71947261582108e+76, 1.54389452316422e+77, 3.08778904632843e+77, 6.17557809265686e+77, 1.23511561853137e+78, 2.47023123706275e+78, 4.94046247412549e+78, 9.88092494825098e+78, 1.9761849896502e+79, 3.95236997930039e+79, 7.90473995860079e+79, 1.58094799172016e+80, 3.16189598344031e+80, 6.32379196688063e+80, 1.26475839337613e+81, 2.52951678675225e+81, 5.0590335735045e+81, 1.0118067147009e+82, 2.0236134294018e+82, 4.0472268588036e+82, 8.09445371760721e+82, 1.61889074352144e+83, 3.23778148704288e+83, 6.47556297408576e+83, 1.29511259481715e+84, 2.59022518963431e+84, 5.18045037926861e+84, 1.03609007585372e+85, 2.07218015170744e+85, 4.14436030341489e+85, 8.28872060682978e+85, 1.65774412136596e+86, 3.31548824273191e+86, 6.63097648546382e+86, 1.32619529709276e+87, 2.65239059418553e+87, 5.30478118837106e+87, 1.06095623767421e+88, 2.12191247534842e+88, 4.24382495069685e+88, 8.48764990139369e+88, 1.69752998027874e+89, 3.39505996055748e+89, 6.79011992111495e+89, 1.35802398422299e+90, 2.71604796844598e+90, 5.43209593689196e+90, 1.08641918737839e+91, 2.17283837475679e+91, 4.34567674951357e+91, 8.69135349902714e+91, 1.73827069980543e+92, 3.47654139961086e+92, 6.95308279922171e+92, 1.39061655984434e+93, 2.78123311968869e+93, 5.56246623937737e+93, 1.11249324787547e+94, 2.22498649575095e+94, 4.4499729915019e+94, 8.89994598300379e+94, 1.77998919660076e+95, 3.55997839320152e+95, 7.11995678640303e+95, 1.42399135728061e+96, 2.84798271456121e+96, 5.69596542912243e+96, 1.13919308582449e+97, 2.27838617164897e+97, 4.55677234329794e+97, 9.11354468659588e+97, 1.82270893731918e+98, 3.64541787463835e+98, 7.29083574927671e+98, 1.45816714985534e+99, 2.91633429971068e+99, 5.83266859942137e+99, 1.16653371988427e+100, 2.33306743976855e+100, 4.66613487953709e+100, 9.33226975907419e+100, 1.86645395181484e+101, 3.73290790362967e+101, 7.46581580725935e+101, 1.49316316145187e+102, 2.98632632290374e+102, 5.97265264580748e+102, 1.1945305291615e+103, 2.38906105832299e+103, 4.77812211664598e+103, 9.55624423329197e+103, 1.91124884665839e+104, 3.82249769331679e+104, 7.64499538663357e+104, 1.52899907732671e+105, 3.05799815465343e+105, 6.11599630930686e+105, 1.22319926186137e+106, 2.44639852372274e+106, 4.89279704744549e+106, 9.78559409489097e+106, 1.95711881897819e+107, 3.91423763795639e+107, 7.82847527591278e+107, 1.56569505518256e+108, 3.13139011036511e+108, 6.26278022073022e+108, 1.25255604414604e+109, 2.50511208829209e+109, 5.01022417658418e+109, 1.00204483531684e+110, 2.00408967063367e+110, 4.00817934126734e+110, 8.01635868253468e+110, 1.60327173650694e+111, 3.20654347301387e+111, 6.41308694602775e+111, 1.28261738920555e+112, 2.5652347784111e+112, 5.1304695568222e+112, 1.02609391136444e+113, 2.05218782272888e+113, 4.10437564545776e+113, 8.20875129091552e+113, 1.6417502581831e+114, 3.28350051636621e+114, 6.56700103273241e+114, 1.31340020654648e+115, 2.62680041309297e+115, 5.25360082618593e+115, 1.05072016523719e+116, 2.10144033047437e+116, 4.20288066094874e+116, 8.40576132189749e+116, 1.6811522643795e+117, 3.362304528759e+117, 6.72460905751799e+117, 1.3449218115036e+118, 2.6898436230072e+118, 5.37968724601439e+118, 1.07593744920288e+119, 2.15187489840576e+119, 4.30374979681151e+119, 8.60749959362303e+119, 1.72149991872461e+120, 3.44299983744921e+120, 6.88599967489842e+120, 1.37719993497968e+121, 2.75439986995937e+121, 5.50879973991874e+121, 1.10175994798375e+122, 2.2035198959675e+122, 4.40703979193499e+122, 8.81407958386998e+122, 1.762815916774e+123, 3.52563183354799e+123, 7.05126366709599e+123, 1.4102527334192e+124, 2.82050546683839e+124, 5.64101093367679e+124, 1.12820218673536e+125, 2.25640437347072e+125, 4.51280874694143e+125, 9.02561749388286e+125, 1.80512349877657e+126, 3.61024699755314e+126, 7.22049399510629e+126, 1.44409879902126e+127, 2.88819759804252e+127, 5.77639519608503e+127, 1.15527903921701e+128, 2.31055807843401e+128, 4.62111615686803e+128, 9.24223231373605e+128, 1.84844646274721e+129, 3.69689292549442e+129, 7.39378585098884e+129, 1.47875717019777e+130, 2.95751434039554e+130, 5.91502868079107e+130, 1.18300573615821e+131, 2.36601147231643e+131, 4.73202294463286e+131, 9.46404588926572e+131, 1.89280917785314e+132, 3.78561835570629e+132, 7.57123671141257e+132, 1.51424734228251e+133, 3.02849468456503e+133, 6.05698936913006e+133, 1.21139787382601e+134, 2.42279574765202e+134, 4.84559149530405e+134, 9.69118299060809e+134, 1.93823659812162e+135, 3.87647319624324e+135, 7.75294639248647e+135, 1.55058927849729e+136, 3.10117855699459e+136, 6.20235711398918e+136, 1.24047142279784e+137, 2.48094284559567e+137, 4.96188569119134e+137, 9.92377138238269e+137, 1.98475427647654e+138, 3.96950855295307e+138, 7.93901710590615e+138, 1.58780342118123e+139, 3.17560684236246e+139, 6.35121368472492e+139, 1.27024273694498e+140, 2.54048547388997e+140, 5.08097094777994e+140, 1.01619418955599e+141, 2.03238837911197e+141, 4.06477675822395e+141, 8.1295535164479e+141, 1.62591070328958e+142, 3.25182140657916e+142, 6.50364281315832e+142, 1.30072856263166e+143, 2.60145712526333e+143, 5.20291425052665e+143, 1.04058285010533e+144, 2.08116570021066e+144, 4.16233140042132e+144, 8.32466280084265e+144, 1.66493256016853e+145, 3.32986512033706e+145, 6.65973024067412e+145, 1.33194604813482e+146, 2.66389209626965e+146, 5.32778419253929e+146, 1.06555683850786e+147, 2.13111367701572e+147, 4.26222735403144e+147, 8.52445470806287e+147, 1.70489094161257e+148, 3.40978188322515e+148, 6.8195637664503e+148, 1.36391275329006e+149, 2.72782550658012e+149, 5.45565101316024e+149, 1.09113020263205e+150, 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Y ahora me voy a pensar en otras cosas.

P.D. Me da asco el editor de posts ese !!!

6 comentarios:

cohelet dijo...

Borracho!
Te voy a decir como lo pensé yo

Bn=1,1,0,-1,-1,0,1,1,-1,-1,0,1,1,..

Tu sucesión es...

A(1)=0
An= 2*A(n-1)+Bn

Yo no lo veo tan complicado.

cohelet dijo...

se mascapao un cero pero tu lo has visto, no?

SamChi dijo...

Piensa, porque pasa esto... Tambien lo pensare.

Anónimo dijo...

I'm impressed with your site, very nice graphics!
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Anónimo dijo...

Greets to the webmaster of this wonderful site! Keep up the good work. Thanks.
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Anónimo dijo...

Your site is on top of my favourites - Great work I like it.
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