This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "bits/stdc++.h"
using namespace std;
#define FAST ios_base::sync_with_stdio(false); cin.tie(0);
#define pb push_back
#define eb emplace_back
#define ins insert
#define ph push
#define f first
#define s second
#define cbr cerr << "hi\n"
#define mmst(x, v) memset((x), v, sizeof ((x)))
#define siz(x) ll(x.size())
#define all(x) (x).begin(), (x).end()
#define lbd(x, y) lower_bound(all(x), y)
#define ubd(x, y) upper_bound(all(x), y)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); //can be used by calling rng() or shuffle(A, A+n, rng)
inline long long rand(long long x, long long y) { return (rng() % (y+1-x)) + x; } //inclusivesss
string inline to_string(char c) {string s(1,c);return s;} template<typename T> inline T gcd(T a,T b){ return a==0?llabs(b):gcd(b%a,a); }
typedef long long ll;
typedef long double ld;
#define FOR(i,s,e) for(ll i=s;i<=ll(e);++i)
#define DEC(i,s,e) for(ll i=s;i>=ll(e);--i)
typedef pair<ll,ll>pi; typedef pair<ll,pi>spi; typedef pair<pi,pi>dpi;
#define LLINF ((long long)1e18)
#define INF int(1e9+1e6)
#define MAXN (300006)
bool state[MAXN];
void solve(){
mmst(state,0);
ll n,q;cin>>n>>q;
FOR(i,0,q-1){
ll a; cin>>a;
state[a]=1;
}
vector<ll> comp;
auto gogo=[&](){
if(comp.empty())return 1;
vector<ll> tmp=comp;
FOR(i,0,siz(comp)-2){
ll val=min(comp[i+1], comp[i]);
comp[i+1] -= val;
comp[i] -= val;
comp[i] -= min(comp[i]/2,(tmp[i]-1)/2) * 2;
assert(comp[i]>=0);
if(comp[i]!=0){
cout<<"-1\n";
return 0;
}
}
comp.back()-=min(comp.back()/2,(tmp.back()-1)/2)*2;
assert(comp.back()>=0);
if(comp.back()){
cout<<"-1\n";
return 0;
}
return 1;
};
FOR(i,1,n){
if(state[i]==0){
if(i>1&&state[i-1]==0) {
++ comp.back();
}else{
comp.pb(1);
}
}else{
if(i>1&&state[i-1]==1){
if(!gogo())return;
comp.clear();
}
}
}
if(!gogo())return;
cout<<0<<'\n'<<'\n';
}
int main(){
FAST
ll t; cin>>t;
while(t--)solve();
}
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