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Project Euler 8 in c++

HomeCategory: stackoverflowProject Euler 8 in c++
Avatarjohn asked 4 months ago

I’m trying to solve problem 8 from project euler but I’m getting way too big numbers as results and I don’t know why.

The problem is “Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?”

My code :

#include <iostream>
#include <string>

int main()
{
    std::string str = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";

    long long a = 1;
    long long fin = 0;

    for (int c = 0; c < 988; c++)
    {
        for (int d = 0; d < 13; d++)
        {
            a = a * str.at(c + d);
        }

        if (a > fin)
        {
            fin = a;
            std::cout << fin << " at " << c << std::endl;
        }

        a = 1;
    }

    system("pause");
}

The output :

7948587103611909356 at 0
8818137127266647872 at 15
8977826317031653376 at 71
9191378290313403392 at 214
9205903071867879424 at 573
Press any key to continue...
1 Answers
Best Answer
AvatarFernando answered 4 months ago
Your Answer

9 + 12 =

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