383-赎金信

bool canConstruct(std::string ransomNote, std::string magazine) {
    if (ransomNote.size() > magazine.size()) {
        return false;
    }
    std::array<int, 26> count{};  // 必须初始化
    for (const char ch : magazine) {
        ++count[ch - 'a'];
    }

    for (const char ch : ransomNote) {
        if (--count[ch - 'a'] < 0) {
            return false;
        }
    }

    return true;
}