J - Smallest Difference （SDUT 2018 Autumn Individual Contest - I）

滴答滴答---题目链接

You are given an array a consists of n elements, find the maximum number of elements you can select from the array such that the absolute difference between any two of the chosen elements is  ≤ 1.

Input

The first line contains an integer T (1 ≤ T ≤ 100), in which T is the number of test cases.

The first line of each test case consist of an integer n (2 ≤ n ≤ 104), in which n is size of the array a

The a line follow containing n elements a1, a2, ..., an (1 ≤ ai ≤ 104), giving the array a.

Output

For each test case, print a single line containing the maximum number of elements you can select from the array such that the absolute difference between any two of the chosen elements is  ≤ 1.

Example

Input

2
3
1 2 3
5
2 2 3 4 5

Output

2
3

#include 
using namespace std;
const int N=10010;
int a[N];
int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int n;
        scanf("%d",&n);
        memset(a,0,sizeof(a));
        for(int i=1; i<=n; i++)
        {
            int x;
            scanf("%d",&x);
            a[x]++;
        }
        int ans=0;
        a[0]=0;
        for(int i=1; i<=10000; i++)
        {
            if(a[i]!=0)
            {
                a[i]+=a[i+1];

            }

            ans=max(ans,a[i]);
        }
        cout<