华为机试 HJ97 题解 | #记负均正#

HJ97 记负均正

#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;

int main() {
    int n;
    while (cin >> n) { // 注意 while 处理多个 case
        vector<int> vec1; // 负数数组
        vector<int> vec2; // 正数数组
        for (int i = 0; i < n; i++) {
            int temp;
            cin >> temp;
            if (temp < 0) {
                vec1.push_back(temp);
            } else if (temp > 0) {
                vec2.push_back(temp);
            }
        }
        double average = 0.0;
        if (vec2.size() > 0) {
            // 计算所有正整数的平均值，结果保留一位小数
            double sum = 0.0;
            for (auto iter = vec2.begin(); iter != vec2.end(); ++iter) {
                sum += *iter;
            }
            average = sum / vec2.size();
        }
        cout << setprecision(1) << fixed << vec1.size() << " "<<  average;
    }
}