Aizu Online Judge 0202 At Boss's Expense

■0202 At Boss's Expense

可能な合計金額と，素数全列挙．

import java.util.*;
import java.lang.*;
import java.math.*;
import java.io.*;

import static java.lang.Math.*;
import static java.util.Arrays.*;

public class Main{

 Scanner sc=new Scanner(System.in);

 int INF=1<<28;
 double EPS=1e-9;

 int n, x;
 int[] a;

 void run(){
  for(;;){
   n=sc.nextInt();
   x=sc.nextInt();
   if((n|x)==0){
    break;
   }
   a=new int[n];
   for(int i=0; i<n; i++){
    a[i]=sc.nextInt();
   }
   solve();
  }
 }

 void solve(){
  int max=1000000;
  int p=0;
  int[] prime=new int[max];
  boolean[] isPrime=new boolean[max+1];
  Arrays.fill(isPrime, true);
  isPrime[0]=isPrime[1]=false;
  for(int i=2; i<=max; i++){
   if(isPrime[i]){
    prime[p++]=i;
    for(int j=2*i; j<=max; j+=i){
     isPrime[j]=false;
    }
   }
  }
  boolean[] dp=new boolean[max+1];
  dp[0]=true;
  for(int j=0; j<n; j++){
   for(int i=a[j]; i<=max; i++){
    dp[i]|=dp[i-a[j]];
   }
  }
  int ans=0;
  for(int i=2; i<=x; i++){
   if(dp[i]&&isPrime[i]){
    ans=i;
   }
  }
  if(ans>0){
   println(ans+"");
  }else{
   println("NA");
  }
 }

 void debug(Object... os){
  System.err.println(Arrays.deepToString(os));
 }

 void print(String s){
  System.out.print(s);
 }

 void println(String s){
  System.out.println(s);
 }

 public static void main(String[] args){
  // System.setOut(new PrintStream(new BufferedOutputStream(System.out)));
  new Main().run();
 }
}