42 lines
820 B
C++
42 lines
820 B
C++
#include <iostream>
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#include <algorithm>
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#include <cstdio>
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using namespace std;
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int b[50],temp[50];
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int cmp(int a,int b){
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return a>b;
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}
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int main(){
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int n,a,t,i,j,k,cur,num,sum,minn,sign;
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scanf("%d",&t);
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while(t--){
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scanf("%d%d",&n,&a);
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sign=0;
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for(i=0;i<n;i++)
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scanf("%d",&b[i]);
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minn=99999999;
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sum=1<<n;
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sort(b,b+n,cmp);
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for(i=1;i<sum;i++){
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j=i;k=cur=0;num=a;
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while(j){
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if(j&1)temp[cur++]=b[k];
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j>>=1;k++;
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}
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if(cur>=minn)
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continue;
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for(j=0;j<cur;j++)
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num%=temp[j];
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if(num==0){
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minn=cur;
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sign=1;
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}
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}
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if(sign)
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printf("%d\n",minn);
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else
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printf("-1\n");
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}
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return 0;
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}
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