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@rhysd
Created July 30, 2012 17:07
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#include <iostream>
#include <string>
#include <numeric>
static const std::string number = "73167176531330624919225119674426574742355349194934"
"96983520312774506326239578318016984801869478851843"
"85861560789112949495459501737958331952853208805511"
"12540698747158523863050715693290963295227443043557"
"66896648950445244523161731856403098711121722383113"
"62229893423380308135336276614282806444486645238749"
"30358907296290491560440772390713810515859307960866"
"70172427121883998797908792274921901699720888093776"
"65727333001053367881220235421809751254540594752243"
"52584907711670556013604839586446706324415722155397"
"53697817977846174064955149290862569321978468622482"
"83972241375657056057490261407972968652414535100474"
"82166370484403199890008895243450658541227588666881"
"16427171479924442928230863465674813919123162824586"
"17866458359124566529476545682848912883142607690042"
"24219022671055626321111109370544217506941658960408"
"07198403850962455444362981230987879927244284909188"
"84580156166097919133875499200524063689912560717606"
"05886116467109405077541002256983155200055935729725"
"71636269561882670428252483600823257530420752963450";
template<class Iter>
int calc(Iter first, Iter last)
{
typedef typename Iter::value_type value_t;
return std::accumulate(first, last, 1,
[](int res, value_t v){
return res * (v-'0');
});
}
int main()
{
int max_value = 0;
for( auto first = number.begin(), last = number.begin()+5;
last != number.end();
++first, ++last){
max_value = std::max(max_value, calc(first, last));
}
std::cout << max_value << std::endl;
return 0;
}
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