3447723_ac_391ms_3060k.java

北大大牛代码 1240道题的原代码 超级权威

import java.util.*;
import java.math.*;

public class Main {
	private Scanner in;

	public static void main(String [] args) {
		System.out.println("MAKING THE GRADE OUTPUT");
		new Main().run();
		System.out.println("END OF OUTPUT");
	}

	private void run() {
		in = new Scanner (System.in);
		int cas;
		int s, t;
		float [][] info;
		int [] bonus;
		int [] absent;
		float [] average;
		float sum, avg, sd;
		int [] grade;
		
		cas = in.nextInt();
		while (cas-- > 0) {
			s = in.nextInt();
			t = in.nextInt();
			sum = 0;
			grade = new int [s];
			info = new float [s][t];
			bonus = new int [s];
			absent = new int [s];
			average = new float [s];
			for (int i = 0; i < s; i++) {
				for (int j = 0; j < t; j++) {
					info[i][j] = in.nextFloat();
				}
				bonus[i] = in.nextInt();
				absent[i] = in.nextInt();
				Arrays.sort(info[i]);
				average[i] = (float)0.0;
				for (int j = 0; j < t; j++) {
					average[i] += info[i][j];
				}
				if (t > 2) {
					average[i] = (average[i] - info[i][0]) / (t - 1);
				} else {
					average[i] /= t;
				}
				average[i] = (float)Math.round(average[i] * (float)10.0) / (float)10.0;
				sum += average[i];
			}
			avg = sum / s;
			avg = (float)Math.round(avg * (float)10.0) / (float)10.0;

			sum = 0;
			for (int i = 0; i < s; i++) {
				sum += (avg - average[i]) * (avg - average[i]);
			}
			sum /= s;
			sd = (float)Math.sqrt(sum);
			sd = (float)Math.round(sd * (float)10.0) / (float)10.0;
			if (sd < 1.0) {
				sd = (float)1.0;
			}
			for (int i = 0; i < s; i++) {
				average[i] = average[i] + bonus[i] / 2 * 3;
			}

			for (int i = 0; i < s; i++) {
				if (average[i] >= (avg + sd)) {
					grade[i] = 4;
				} else {
					if (average[i] >= avg) {
						grade[i] = 3;
					} else {
						if (average[i] >= avg - sd) {
							grade[i] = 2;
						} else {
							grade[i] = 1;
						}
					}
				}
			}

			for (int i = 0; i < s; i++) {
				grade[i] -= (absent[i] / 4);
				if (grade[i] < 0) {
					grade[i] = 0;
				}
			}

			for (int i = 0; i < s; i++) {
				if((grade[i] != 4) && (absent[i] == 0)) {
					grade[i]++;
				}
			}

			sum = 0;
			for (int i = 0; i < s; i++) {
				sum += grade[i];
			}

			float ans;

			ans = sum / s;
			ans = (float)Math.round(ans * (float)10.0) / (float)10.0;
			System.out.println(ans);
		}
		in.close();
	}
}