高校数学の質問スレ（医者・東大卒専用） Part438

高校数学の質問スレ（医者・東大卒専用） Part438 (899ﾚｽ)
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44: 2024/08/15(木)10:18 ID:5ggTekS4(1/2) AA×
>>1

44:  [sage] 2024/08/15(木) 10:18:26.54 ID:5ggTekS4

bWin <- function(x){# 1 beats 3, 3 beats 2, 2 beats 1
if(length(unique(x))!=2 ) return(0) # no winner
u=sort(unique(x))
if(all(u==c(1,2))) return(sum(x==2)) # how many winners who won by 2
if(all(u==c(2,3))) return(sum(x==3)) # how many winners who won by 3
if(all(u==c(1,3))) return(sum(x==1)) # how many winners who won by 1
}

janken.till.winner.sim <- function(n){ # janken till someone wins
if(n<2) return(NA)
x=sample(1:3,n,replace = TRUE) # janken by n people
count=1 # counter of janken game
while(bWin(x)==0){ # if draw try again
x=sample(1:3,n,replace = TRUE) # janken again till someone win
count=count+1
}
c(bWin(x),count) # return how many winners and counter
}

janken.till.chamipion.sim <- \(n){
re=janken.till.winner.sim(n)
count=re[2]
winner=re[1]
while(winner>1){
re=janken.till.winner.sim(n)
count=count+re[2]
winner=re[1]
}
count
}
res=replicate(1e5,janken.till.chamipion.sim(9))
summary(res)
hist(res,col=2,breaks='scott',freq=FALSE,xlab='count',main='')
BEST::plotPost(res,showMode = TRUE,breaks='scott')

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