在C++的Euler8项目中，我不知道出了什么问题

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

int main() {
    std::ifstream file("euler8_number.txt");
    if (!file.is_open()) {
        std::cerr << "Failed to open file." << std::endl;
        return 1;
    }

    std::string number;
    std::getline(file, number);
    file.close();

    const int N = 13;
    long long maxProduct = 0;

    for (size_t i = 0; i <= number.size() - N; ++i) {
        long long product = 1;
        for (int j = 0; j < N; ++j) {
            product *= number[i + j] - '0';
        }
        if (product > maxProduct) {
            maxProduct = product;
        }
    }

    std::cout << "The maximum product of 13 consecutive digits is: " << maxProduct << std::endl;
    return 0;
}