C++按数值对tuple<string、float>的向量进行排序，然后按字典顺序排序

#include <iostream>
#include <vector>
#include <tuple>
#include <algorithm>

bool compare(const std::tuple<std::string, float>& a, const std::tuple<std::string, float>& b) {
    // 按照数值进行排序
    if (std::get<1>(a) < std::get<1>(b)) {
        return true;
    }
    else if (std::get<1>(a) > std::get<1>(b)) {
        return false;
    }
    
    // 数值相等时，按照字典顺序进行排序
    return std::get<0>(a) < std::get<0>(b);
}

int main() {
    std::vector<std::tuple<std::string, float>> vec = { {"apple", 3.5}, {"banana", 2.0}, {"orange", 3.5}, {"grape", 2.5} };
    
    std::sort(vec.begin(), vec.end(), compare);
    
    for (const auto& item : vec) {
        std::cout << std::get<0>(item) << " " << std::get<1>(item) << std::endl;
    }
    
    return 0;
}