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008.cpp
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008.cpp
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#include <algorithm>
#include <cstddef>
#include <functional>
#include <iostream>
#include <numeric>
#include <string>
#define WINDOW_SIZE 13
static const std::string input = "73167176531330624919225119674426574742355349194934"
"96983520312774506326239578318016984801869478851843"
"85861560789112949495459501737958331952853208805511"
"12540698747158523863050715693290963295227443043557"
"66896648950445244523161731856403098711121722383113"
"62229893423380308135336276614282806444486645238749"
"30358907296290491560440772390713810515859307960866"
"70172427121883998797908792274921901699720888093776"
"65727333001053367881220235421809751254540594752243"
"52584907711670556013604839586446706324415722155397"
"53697817977846174064955149290862569321978468622482"
"83972241375657056057490261407972968652414535100474"
"82166370484403199890008895243450658541227588666881"
"16427171479924442928230863465674813919123162824586"
"17866458359124566529476545682848912883142607690042"
"24219022671055626321111109370544217506941658960408"
"07198403850962455444362981230987879927244284909188"
"84580156166097919133875499200524063689912560717606"
"05886116467109405077541002256983155200055935729725"
"71636269561882670428252483600823257530420752963450";
int main(int argc, char* argv[])
{
auto max_prod = 0ul;
for(std::size_t i = 0u; i <= input.size() - WINDOW_SIZE; ++i)
{
auto substring = input.substr(i, WINDOW_SIZE);
std::array<unsigned int, WINDOW_SIZE> window;
std::transform(substring.begin(), substring.end(), window.begin(),
[](std::string::value_type c) -> unsigned int
{ return c - '0'; });
auto curr_prod = std::accumulate(window.begin(), window.end(), 1ul, std::multiplies<unsigned long>());
max_prod = std::max(max_prod, curr_prod);
}
std::cout << max_prod << std::endl;
return 0;
}