C.cpp

#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> pll;
#define endl "\n";
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)

ll const inf = 1e18;
ll const maxn = 1e6+5;
ll const mod = 1e9+7;

// code begins here

int main(){
    fast;
    
    ll t;
    cin>>t;
    
    while(t--){
        ll n;
        cin>>n;
        
        vector<ll> arr(n);
        for(auto &u: arr)
            cin>>u;
        
        ll even = 0, odd = 0, cons = 0;
        
        sort(arr.begin(), arr.end());
        
        for(ll i=0;i<n;i++){
            if(arr[i]%2)
                odd++;
            else
                even++;
            if((i-1)>=0 && arr[i]==(arr[i-1]+1))
                cons = 1;
        }
        
        if(even%2==0){
            cout<<"YES"<<endl;
        } else if(cons) {
            cout<<"YES"<<endl;
        } else {
            cout<<"NO"<<endl;
        }
    }
    
    return 0;
}