#include <bits/stdc++.h>

using namespace std;

// #define LOCK_GETCHAR
// #define USE_INT_128

#if __cplusplus < 201400
#warning "Please use c++14 or higher."
#define CONSTEXPR_FUNC
#define ENABLE_IF_INT
#else
#define CONSTEXPR_FUNC constexpr
#define ENABLE_IF_INT , enable_if_t<_is_integer<T>, int> = 0
template <class T> constexpr bool _is_integer = numeric_limits<T>::is_integer;
template <> constexpr bool _is_integer<bool> = false;
template <> constexpr bool _is_integer<char> = false;
#ifdef USE_INT_128
template <> constexpr bool _is_integer<__int128> = true;
template <> constexpr bool _is_integer<__uint128_t> = true;
#endif
#endif

#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(LOCK_GETCHAR)
#define getchar getchar_unlocked
#endif

#define il inline
#define mkp make_pair
#define fi first
#define se second
#define ssz(x) (signed((x).size()))
#define _loop_i_t(j, k) make_signed_t<decltype((j) - (k))>
#define For(i, j, k) for (_loop_i_t(j, k) i = (j); i <= (k); ++i) // NOLINT
#define ForDown(i, j, k)                                                       \
  for (_loop_i_t(j, k) i = (j); i >= decltype(i)(k); --i) // NOLINT
#define eb emplace_back
#ifndef ONLINE_JUDGE
#define FileIO(filename)                                                       \
  freopen(filename ".in", "r", stdin);                                         \
  freopen(filename ".out", "w", stdout)
#else
#define FileIO(filename) void(0)
#endif

using ll = long long;
using uint = unsigned int;
using ull = unsigned long long;
using db = double;
using ldb = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#ifdef USE_INT_128
using lll = __int128_t;
using ulll = __uint128_t;
#endif

// clang-format off
CONSTEXPR_FUNC il ll qpow(ll x, ull y, ll mod){ ll ans = 1; x %= mod; while (y) { if (y & 1) (ans *= x) %= mod; (x *= x) %= mod; y >>= 1; } return ans; }
template<typename T> CONSTEXPR_FUNC il void cmin(T & x, const T &y){ x = min(x, y); }
template<typename T> CONSTEXPR_FUNC il void cmax(T & x, const T &y){ x = max(x, y); }
template<typename T ENABLE_IF_INT> il void read(T &x){ x = 0; int f = 1; int c = getchar(); while (!isdigit(c)) { if (c == '-') f = -1; c = getchar(); } while (isdigit(c)) { x = x * 10 + (c - '0'); c = getchar(); } x *= f; }
template<typename T, typename ... Args> il void read(T &x, Args &... y){ read(x), read(y...); }
// clang-format on

// File head end

namespace {
constexpr ll MAXN = 1e5 + 5;
int c, T, n, m;
ll a[MAXN];
void Main() {
  read(c, T);
  while (T--) {
    read(n, m);
    ll val = 0, cost = 0;
    For(i, 1, n) read(a[i]), val ^= a[i];
    ForDown(i, 59, 0) if (val >> i & 1) {
      pair<ll, int> minv = {LLONG_MAX, 0};
      ll msk = (1ll << i) - 1;
      For(j, 1, n) if (!(a[j] >> i & 1)) {
        cmin(minv, mkp(msk + 1 - (a[j] & msk), j));
      }
      if (!minv.se) {
        For(j, i + 1, 60) {
          pair<ll, int> v1 = {LLONG_MAX, 0}, v2 = {LLONG_MAX, 0};
          ll msk2 = (1ll << j) - 1;
          For(k, 1, n) if (!(a[k] >> j & 1)) {
            auto cur = mkp(msk2 + 1 - (a[k] & msk2), k);
            if (cur <= v1)
              v2 = v1, v1 = cur;
            else
              cmin(v2, cur);
          }
          if (v1.se && v2.se) {
            cost += v1.fi + v2.fi;
            val ^= a[v1.se] ^ a[v2.se];
            a[v1.se] += v1.fi, a[v2.se] += v2.fi;
            val ^= a[v1.se] ^ a[v2.se];
            break;
          }
        }
      } else {
        cost += minv.fi;
        val ^= a[minv.se];
        a[minv.se] += minv.fi;
        val ^= a[minv.se];
      }
    }
    cout << cost << "\n0\n";
  }
}
} // namespace

signed main() { return Main(), 0; }