c++

好的，下面是 C++ 版本的代码实现：

#include <iostream>

using namespace std;

double maximize_good_rate(int good_count, int bad_count, int budget) {
    double good_rate = (double)good_count / (good_count + bad_count);
    while (budget > 0 && good_rate < 1) {
        // 花钱买水军增加一条好评
        if (budget > 0) {
            good_count += 1;
            budget -= 1;
        }
        // 举报掉一条差评
        if (bad_count > 0 && budget > 0) {
            bad_count -= 1;
            budget -= 1;
        }
        good_rate = (double)good_count / (good_count + bad_count);
    }
    return good_rate;
}

int main() {
    int good_count, bad_count, budget;
    cin >> good_count >> bad_count >> budget;
    double max_good_rate = maximize_good_rate(good_count, bad_count, budget);
    printf("%.10lf\n", max_good_rate);
    return 0;
}

输入格式为三个整数，分别表示当前好评数、差评数和预算，输出保留 10 位小数的最大好评率。