解题思路:
import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class C1199 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); while (sc.hasNext()) { int n = sc.nextInt(), b = 0, count = 0; List<Integer> list = new ArrayList<Integer>(); for(int a = 3; a < n; a+=2){ if(!list.contains(a) && isSu(a)){ b = n - a; if(isSu(b)){ //System.out.printf("%d=%d+%d\n", n, a, b); count++; list.add(b); } } } System.out.println(count); } sc.close(); } private static boolean isSu(int k){ if(k < 2) return false; for(int i = 2; i*i <= k; i++){ if(k % i == 0) return false; } return true; } }
注意事项:
参考代码:
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