#include <bits/stdc++.h>
using namespace std;
#define read(type) readInt<type>() // Fast read
#define ll long long
#define nL "\n"
#define pb push_back
#define mk make_pair
#define pii pair<int, int>
#define a first
#define b second
#define vi vector<int>
#define all(x) (x).begin(), (x).end()
#define umap unordered_map
#define uset unordered_set
#define MOD 1000000007
#define imax INT_MAX
#define imin INT_MIN
#define exp 1e9
#define sz(x) (int((x).size()))
 
 
void solve() {
    int n; cin >> n;
    map<ll,ll> d; 
 
    for(auto i = 0; i < n; i++) {
        ll o; cin >> o;
        if (d.find(o) != d.end()) {
            d[o]++;
        } else {d[o] = 1;}
    }
 
    int ans = 0;
 
    int len = 1;
    pair<ll,ll> cur = *d.begin();
 
    while((int)d.size() != 0) {
        if (len == 1) {cout << "Add one " << endl; ans++;}
        cout << "handing: " << cur.a << endl;
        if (d.find(cur.a+1) != d.end()) {
            cout << "found " << cur.a+1 << endl;
            cur = *d.find(cur.a+1);
 
            d[cur.a-1]--;
            if (d[cur.a-1] <= 0) {d.erase(cur.a-1);}
 
            len++;
        } else {
            cout << "Not found " << cur.a+1 << endl;
            d[cur.a]--;
            if (d[cur.a] <= 0) {d.erase(cur.a);}
            cur = *d.begin();
            len = 1;
        }
    }
 
    cout << ans << endl;
 
}
 
 
 
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t; cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}

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

MTAKNgoyIDIgMyA0IDMgMQo1CjExIDggNyAxMCA5CjYKMTAwMDAwMDAwMCAxMDAwMDAwMDAwIDEwMDAwMDAwMDAgMTAwMDAwMDAwMCAxMDAwMDAwMDAwIDEwMDAwMDAwMDAKOAoxIDEgNCA0IDIgMyAyIDMKNgoxIDIgMyAyIDMgNAo3CjEwIDExIDExIDEyIDEyIDEzIDEzCjcKOCA4IDkgOSAxMCAxMCAxMQo4CjQgMTQgNSAxNSA2IDE2IDcgMTcKOAo1IDE1IDYgMTQgOCAxMiA5IDExCjUKNCAyIDIgMyA0Cg==

10
6
2 2 3 4 3 1
5
11 8 7 10 9
6
1000000000 1000000000 1000000000 1000000000 1000000000 1000000000
8
1 1 4 4 2 3 2 3
6
1 2 3 2 3 4
7
10 11 11 12 12 13 13
7
8 8 9 9 10 10 11
8
4 14 5 15 6 16 7 17
8
5 15 6 14 8 12 9 11
5
4 2 2 3 4