题解 | #统计成绩#

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

int main() {
    int n;
    cin >> n;

    float max_score = 0.0;
    float min_score = 100.0;
    float avg_score;
    float sum = 0;

    for (int i = 0; i < n; ++i) {
        float a;
        cin >> a;
        if (a > max_score)
            max_score = a;
        if (a < min_score)
            min_score = a;
        sum += a;
    }

    avg_score = sum / n;
    cout << fixed << setprecision(2) << max_score << " "
         << min_score << " " << avg_score;
}
// 64 位输出请用 printf("%lld")

给一个C++的版本，一开始用的数组，没想到超时了，数据也没有保存的需要，所以每次读进来一个数就扔掉一个，这样内存开销也比数组小了很多。