T1 构造:手玩一下就能发现规律。偶数不行,因为所有的a+b加起来后,除n模为0,而c不为0 import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); if (n%2==0) { System.out.println("NO"); retu...