My code kept giving WA / RA and I am not quite sure why. It clears the sample as well as self made testcases too.

```
void decToBinary(ll n, ll bitKeep[MAX]) {
ll i = 0;
while (n > 0) {
if(n & 1)
bitKeep[i]++;
n /= 2;
i++;
}
}
int main() {
fastIO;
ll t; cin >> t;
for(ll q = 0; q < t; q++) {
ll bitKeep[MAX] = {0};
ll n, k; cin >> n >> k;
ll a[n];
for(ll i = 0; i < n; i++) {
cin >> a[i];
decToBinary(a[i], bitKeep);
}
vpll vals;
for(ll i = 0; i < MAX; i++) {
if(bitKeep[i])
vals.pb(mp(bitKeep[i] * (1<<i), i));
}
sort(vals.rbegin(), vals.rend());
ll ansArr[MAX] = {0};
for(ll i = 0, x = 0; i < MAX && x < k; i++, x++)
ansArr[vals[i].second] = 1;
ll ans = 0;
for(ll i = 0; i < MAX; i++)
if(ansArr[i])
ans += (1<<i);
cout << ans << endl;
}
return 0;
}
```

For those who might want to see the submission : here

Thanks in advanced.