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Project Euler Problem 8

2014年03月12日

Q

Find the greatest product of five consecutive digits in the 1000-digit number.
 73167176531330624919225119674426574742355349194934
 96983520312774506326239578318016984801869478851843
 85861560789112949495459501737958331952853208805511
 12540698747158523863050715693290963295227443043557
 66896648950445244523161731856403098711121722383113
 62229893423380308135336276614282806444486645238749
 30358907296290491560440772390713810515859307960866
 70172427121883998797908792274921901699720888093776
 65727333001053367881220235421809751254540594752243
 52584907711670556013604839586446706324415722155397
 53697817977846174064955149290862569321978468622482
 83972241375657056057490261407972968652414535100474
 82166370484403199890008895243450658541227588666881
 16427171479924442928230863465674813919123162824586
 17866458359124566529476545682848912883142607690042
 24219022671055626321111109370544217506941658960408
 07198403850962455444362981230987879927244284909188
 84580156166097919133875499200524063689912560717606
 05886116467109405077541002256983155200055935729725
 71636269561882670428252483600823257530420752963450

R

First Version

test <- read.table("1000",header=FALSE,colClass="character")
Nums <- as.numeric(unlist(strsplit(test$V1,'')))
pro <- numeric()
for(i in 1:(1000-4))
{
  pro[i] <- prod(Nums[i+(0:4)])
}
print(max(pro))