project-euler

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Euler_8.cpp (590B)

      1 #include <fstream>
      2 
      3 #include "Euler.h"
      4 
      5 llui Euler::FindGreatestProductOf13AdjacentDigits()
      6 {
      7     std::ifstream fin;
      8     fin.open("files/p8_digits.txt");
      9 
     10     std::string number;
     11 
     12     std::getline(fin, number);
     13 
     14     fin.close();
     15 
     16     llui greatestProduct = 0;
     17 
     18     for (unsigned i = 0; i < number.length() - 13; ++i)
     19     {
     20         std::vector<int> digits;
     21 
     22         llui temp = 1;
     23 
     24         for (unsigned j = i; j < i + 13; ++j)
     25             temp *= (number.at(j) - 48);
     26 
     27         if (temp > greatestProduct) {
     28             greatestProduct = temp;
     29         }
     30     }
     31 
     32     return greatestProduct;
     33 }