就非要endl不可吗？

用python...

#include #include #include #include #include #include #include #include #include #include #include <unordered_map> #include <unordered_set> #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include <type_traits> #include #include #include #include #include <forward_list> #include #include #include <initializer_list> #include #include #include #include #include #include #include #include #include #include <condition_variable> #include #include <shared_mutex> #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include <bits/stdc++.h>

template class NumericValue; template class ArithmeticOperation; class InputHandler; class OutputHandler; class CalculationDirector; class CalculationStrategy;

namespace TypeTraits { template struct is_numeric : std::integral_constant<bool, std::is_integral::value || std::is_floating_point::value> {};

template<typename T>
constexpr bool is_numeric_v = is_numeric<T>::value;

template<typename T, typename = std::enable_if_t<is_numeric_v<T>>>
struct NumericLimits {
    static constexpr T min() { return std::numeric_limits<T>::min(); }
    static constexpr T max() { return std::numeric_limits<T>::max(); }
};

}

template class NumericInterface { public: virtual ~NumericInterface() = default; virtual T getValue() const = 0; virtual void setValue(T value) = 0; virtual std::unique_ptr<NumericInterface> clone() const = 0; };

template class NumericValue : public NumericInterface { static_assert(TypeTraits::is_numeric_v, "Type must be numeric");

private: T value_; mutable std::mutex mutex_;

public: NumericValue() : value_(T{}) {} explicit NumericValue(T value) : value_(value) {} NumericValue(const NumericValue& other) { std::lock_guardstd::mutex lock(other.mutex_); value_ = other.value_; }

NumericValue& operator=(const NumericValue& other) {
    if (this != &other) {
        std::lock(mutex_, other.mutex_);
        std::lock_guard<std::mutex> lockThis(mutex_, std::adopt_lock);
        std::lock_guard<std::mutex> lockOther(other.mutex_, std::adopt_lock);
        value_ = other.value_;
    }
    return *this;
}

T getValue() const override {
    std::lock_guard<std::mutex> lock(mutex_);
    return value_;
}

void setValue(T value) override {
    std::lock_guard<std::mutex> lock(mutex_);
    value_ = value;
}

std::unique_ptr<NumericInterface<T>> clone() const override {
    return std::make_unique<NumericValue<T>>(*this);
}

using Observer = std::function<void(T)>;
void addObserver(Observer observer) {
    std::lock_guard<std::mutex> lock(mutex_);
    observers_.push_back(observer);
}

private: std::vector observers_;

void notifyObservers() {
    T currentValue;
    {
        std::lock_guard<std::mutex> lock(mutex_);
        currentValue = value_;
    }
    for (const auto& observer : observers_) {
        observer(currentValue);
    }
}

};

template class OperationInterface { public: virtual ~OperationInterface() = default; virtual T execute(const T& a, const T& b) const = 0; virtual std::string getName() const = 0; virtual std::unique_ptr<OperationInterface> clone() const = 0; };

template class AdditionOperation : public OperationInterface { public: T execute(const T& a, const T& b) const override { if (b >= 0) { T result = a; for (T i = T{}; i < b; ++i) { result += T{1}; } return result; } else { T result = a; for (T i = T{}; i > b; --i) { result -= T{1}; } return result; } }

std::string getName() const override {
    return "addition";
}

std::unique_ptr<OperationInterface<T>> clone() const override {
    return std::make_unique<AdditionOperation<T>>(*this);
}

};

class CalculationStrategy { public: virtual ~CalculationStrategy() = default; virtual long long calculate(long long a, long long b) const = 0; virtual std::string getStrategyName() const = 0; };

class SequentialCalculation : public CalculationStrategy { public: long long calculate(long long a, long long b) const override { AdditionOperation addOp; return addOp.execute(a, b); }

std::string getStrategyName() const override {
    return "sequential";
}

};

class ParallelCalculation : public CalculationStrategy { public: long long calculate(long long a, long long b) const override { auto computeA = std::async(std::launch::async, a { std::this_thread::sleep_for(std::chrono::microseconds(1)); return a; });

    auto computeB = std::async(std::launch::async, [b]() {
        std::this_thread::sleep_for(std::chrono::microseconds(1));
        return b;
    });
    
    AdditionOperation<long long> addOp;
    return addOp.execute(computeA.get(), computeB.get());
}

std::string getStrategyName() const override {
    return "parallel";
}

};

class NumberExpression { public: virtual ~NumberExpression() = default; virtual long long interpret() const = 0; virtual std::unique_ptr clone() const = 0; };

class ConstantExpression : public NumberExpression { private: long long value_;

public: explicit ConstantExpression(long long value) : value_(value) {}

long long interpret() const override {
    return value_;
}

std::unique_ptr<NumberExpression> clone() const override {
    return std::make_unique<ConstantExpression>(*this);
}

};

class StringNumberExpression : public NumberExpression { private: std::string str_;

public: explicit StringNumberExpression(std::string str) : str_(std::move(str)) {}

long long interpret() const override {
    bool negative = false;
    size_t pos = 0;
    
    if (str_.empty()) {
        throw std::invalid_argument("Empty string");
    }
    
    if (str_[0] == '-') {
        negative = true;
        pos = 1;
    }
    
    long long result = 0;
    for (; pos < str_.size(); ++pos) {
        if (!std::isdigit(static_cast<unsigned char>(str_[pos]))) {
            throw std::invalid_argument("Invalid character in number string");
        }
        result = result * 10 + (str_[pos] - '0');
    }
    
    return negative ? -result : result;
}

std::unique_ptr<NumberExpression> clone() const override {
    return std::make_unique<StringNumberExpression>(*this);
}

};

class InputHandler { private: using Token = std::string; std::vector tokens_;

public: void readInput() { std::string line; std::getline(std::cin, line); tokenize(line); }

std::vector<std::unique_ptr<NumberExpression>> parseNumbers() const {
    std::vector<std::unique_ptr<NumberExpression>> expressions;
    
    for (const auto& token : tokens_) {
        expressions.push_back(std::make_unique<StringNumberExpression>(token));
    }
    
    if (expressions.size() != 2) {
        throw std::runtime_error("Expected exactly two numbers");
    }
    
    return expressions;
}

private: void tokenize(const std::string& input) { std::istringstream iss(input); Token token;

    while (iss >> token) {
        tokens_.push_back(token);
    }
}

};

class OutputHandler { public: template void printResult(const T& result) const { std::cout << result << std::endl; }

template<typename T>
void printDebugInfo(const std::string& message, const T& value) const {
}

};

class CalculationDirector { private: std::unique_ptr strategy_; OutputHandler outputHandler_;

public: CalculationDirector() : strategy_(std::make_unique()) {}

void setStrategy(std::unique_ptr<CalculationStrategy> strategy) {
    strategy_ = std::move(strategy);
}

long long performCalculation(long long a, long long b) const {
    outputHandler_.printDebugInfo("Using strategy", strategy_->getStrategyName());
    return strategy_->calculate(a, b);
}

};

class NumericFactory { public: template static std::unique_ptr<NumericInterface> createNumeric(T value) { return std::make_unique<NumericValue>(value); } };

class ApplicationManager { private: InputHandler inputHandler_; OutputHandler outputHandler_; CalculationDirector calculationDirector_; static std::unique_ptr instance_; static std::once_flag initFlag_;

ApplicationManager() {
    initialize();
}

friend std::unique_ptr<ApplicationManager> std::make_unique<ApplicationManager>();

void initialize() {
    std::srand(std::time(nullptr));
    if (std::rand() % 2 == 0) {
        calculationDirector_.setStrategy(std::make_unique<SequentialCalculation>());
    } else {
        calculationDirector_.setStrategy(std::make_unique<ParallelCalculation>());
    }
}

public: ApplicationManager(const ApplicationManager&) = delete; ApplicationManager& operator=(const ApplicationManager&) = delete;

static ApplicationManager& getInstance() {
    std::call_once(initFlag_, []() {
        instance_ = std::make_unique<ApplicationManager>();
    });
    return *instance_;
}

int run() {
    try {
        outputHandler_.printDebugInfo("Application started", "");
        
        inputHandler_.readInput();
        auto expressions = inputHandler_.parseNumbers();
        
        long long a = expressions[0]->interpret();
        long long b = expressions[1]->interpret();
        
        auto numA = NumericFactory::createNumeric(a);
        auto numB = NumericFactory::createNumeric(b);
        
        long long result = calculationDirector_.performCalculation(
            numA->getValue(), numB->getValue()
        );
        
        outputHandler_.printResult(result);
        
        outputHandler_.printDebugInfo("Application finished successfully", "");
        return 0;
    } catch (const std::exception& e) {
        outputHandler_.printDebugInfo("Error occurred", e.what());
        return 1;
    }
}

};

std::unique_ptr ApplicationManager::instance_ = nullptr; std::once_flag ApplicationManager::initFlag_;

int main() { return ApplicationManager::getInstance().run(); }

#include<bits/stdc++.h> using namespace std; int main(){ long long a,b; cin>>a>>b; string s = to_string(a+b); cout<<s; return 0; }

是不是因为没有高精度？(a + b > 2 ^ 64)

语言要选 C++ 系列的

这哪道题，我就是用这个方法A的

不是高精度，那这哪里有问题

不是高精度，贝贝们

如果是高精度建议用string或数组模拟加法，当然你也可以使用int 128 (我不建议)

有没有一种可能，是高精度a+b

有没有一种可能，是高精度a+b。。。

没错啊

换Python

有没有一种可能，是高精度a+b