import java.util.Scanner; import java.util.Formatter; //使用同Scanner public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); Formatter f = new Formatter(System.out); int[] a = new int[3]; float sum = 0; for(byte i = 0;i<3;i++) { a[i] = scanner.nextInt(); } for(byte i = 0;i < 3;i++) { for(byte j = 1;j < a[i] + 1;j++) { switch(i) { case 0: sum += j; break; case 1: sum = sum + j*j; break; case 2: sum = sum + (float)1/j; break; } } } f.format("%.2f",sum); } }
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