HDOJ 1202 The calculation of GPA

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HDACM1202

注意：学分和成绩都是浮点型，GPA不存在，输出-1

import java.util.Scanner;public class Main{    public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        while (sc.hasNext()) {            int n = sc.nextInt();            double sSum = 0;            double pSum = 0;            while (n-->0){                double s = sc.nextDouble();                double p = sc.nextDouble();                if (p==-1) {                    continue;                }                sSum += s;                if (p<60) {                    continue;                }                if (p<70) {                    pSum += s;                }else if(p<80) {                    pSum += s*2;                }else if (p<90) {                    pSum += s*3;                }else if(p<=100){                    pSum += s*4;                }            }            if (sSum==0) {                System.out.println(-1);            }else{                System.out.printf("%.2f",pSum/sSum);                System.out.println();            }        }    }}

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