1010 一元多项式求导 (25 分) Java练习&PTA乙级

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题意：

给定多项式系数次数，求导数

解：

读入数组，注意格式，零多项式就是0，最后判断一下

import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Vector;

public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int[] a = new int[1007];
		int id = 1;
		while(in.hasNext()) {
			a[id++] = in.nextInt();
		}
		int n = id-1;
		//System.out.println(n + "---");
		boolean f = false;
		for(int i = 2; i <= n; i += 2) {
			int t1 = a[i-1]*a[i];
			int t2 = a[i]-1;
			if(t1 == 0) {
				continue;
			}
			else {
				if(f) {
					System.out.print(" " + t1 + " " + t2);
				}
				else {
					f = true;
					System.out.print(t1 + " " + t2);
				}
			}
		}
		if(!f) System.out.println("0 0");
	}
	
}