#include <iostream> #include <iomanip> // 用于控制输出格式 using namespace std; int main() { int n; cin >> n; // 输入学生人数 if (n <= 0) { cout << "0 0.00 0 0" << endl; return 0; } int scores[n]; for (int i = 0; i < n; ++i) { cin >> scores[i]; // 输入每个学生的成绩 } int total = 0; int maxScore = scores[0]; int minScore = scores[0]; for (int i = 0; i < n; ++i) { total += scores[i]; // 累加总分 if (scores[i] > maxScore) { maxScore = scores[i]; // 更新最高分 } if (scores[i] < minScore) { minScore = scores[i]; // 更新最低分 } } double average = static_cast<double>(total) / n; // 计算平均分 // 设置输出格式，保留两位小数 cout << fixed << setprecision(2); cout << total << " " << average << " " << maxScore << " " << minScore << endl; return 0; }