*说明：原程序转载自 @wangjingxi_

↓下面是程序↓

#include<bits/stdc++.h>
using namespace std;

int main() {
    long long n;
    cin >> n;
    long long a[n];
    for (long long i = 0; i < n; i++) {
        cin >> a[i];
    }

    for (long long i = 0; i < n; i++) {
        long long num = a[i];
        vector<int> digits;
        while (num > 0) {
            digits.push_back(num % 10);
            num /= 10;
        }
        reverse(digits.begin(), digits.end());
        for (size_t j = 1; j < digits.size(); j += 2) {
            digits[j] *= 7;
            while (digits[j] > 9) {
                int sum = 0;
                while (digits[j] > 0) {
                    sum += digits[j] % 10;
                    digits[j] /= 10;
                }
                digits[j] = sum;
            }
        }
        long long sum = accumulate(digits.begin(), digits.end(), 0);
        if (sum % 8 == 0) {
            cout << 'T' << endl;
        } else {
            cout << 'F' << endl;
        }
    }

    return 0;
}

莫名其妙WA了一个，求调！