http://poj.org/problem?id=2739 import java.util.*; public class Main{ public static void main(String args[]){ Scanner sc=new Scanner(System.in); int n=1; while(true){ n=sc.nextInt(); if(n==0) break; System.out.println(test2(n)); } } /* * Sum of Consecutive Prime Numbers */ public static int test2(int x){ int count=0; for(int i=2;i+i< x;i++){ int sum = 0; if(!isPrime(i)){ continue; } for(int j=i;j< x;j++){ // �ж��Ƿ�Ϊ���� if(!isPrime(j)) continue; sum = sum+j; // �ж��Ƿ�������� if(sum>=x){ if(sum==x){ count++; } break; } } } if(isPrime(x)) count++; return count; } /* * �ж�ij�����Ƿ�Ϊ��������Ƿ���true */ public static boolean isPrime(int x){ for(int i=2;i*i<=x;i++){ if(x%i==0) return false; } return true; } }
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