The mysterious mission is to decrypt the hidden infomation from the statement of problems.

Here is how to solve it in detail:

Part of input in the example input of the problem H is obviously three of four pieces of an QR-code:

11 11111110111 10000010010 10111010011 10111010011 10111010001 10000010000 11111110101 00000000111 11011010011 10010101100 11101010100 11 11011111110 10010000010 00010111010 10010111010 01010111010 11010000010 01011111110 11000000000 01010000010 01000111100 00000001010 11 11010101001 11001010100 00000000110 11111110010 10000010010 10111010110 10111010111 10111010010 10000010110 11111110100 00000000000

And we can also find that it has a missing part after arrangement:

██████████████  ██████████  ██████████████
██          ██    ██  ██    ██          ██
██  ██████  ██    ████      ██  ██████  ██
██  ██████  ██    ██████    ██  ██████  ██
██  ██████  ██      ██  ██  ██  ██████  ██
██          ██        ████  ██          ██
██████████████  ██  ██  ██  ██████████████
                ██████████
████  ████  ██    ████  ██  ██          ██
██    ██  ██  ████      ██      ████████
██████  ██  ██  ██                  ██  ██
████  ██  ██  ██    ██
████    ██  ██  ██
                ████
██████████████    ██
██          ██    ██
██  ██████  ██  ████
██  ██████  ██  ██████
██  ██████  ██    ██
██          ██  ████
██████████████  ██

The next task is that how to find the missing part.

The last input of H look like a charactor 'C', so we can turn to the problem C to find more information about it.

In the last example input of C, we can find a array with length of 11, which is seemed to be the missing part of our QRcode. Coding to turn the array to the binary representation and filling the QRcode with that result, we can get a mysterious URL after scanning the the completed QRcode.

void solve() {
    int n;
    std::cin >> n;
    while (n--) {
        // std::string s;
        int s;
        std::cin >> s;
        
        for (auto c : std::bitset<11>(s).to_string()) {
            std::cout << (c == '1' ? "██" : "  ");
        }

        std::cout << "\n";
    }
}

http://u5a.cn/JDtn0

However, it just get expired in this pastebin website, so we could never get the hidden information that the author want to pass. (which is sad, tbh)