#include <bits/stdc++.h>
using namespace std;
inline void using_file(string s) {
  freopen((s + ".in").c_str(), "r", stdin);
  freopen((s + ".out").c_str(), "w", stdout);
}
mt19937 gen_rand;
template <typename T, typename U>
ostream &operator<<(ostream &os, pair<T, U> &a) {
  os << "(";
  os << a.first << ", ";
  os << a.second;
  os << ")";
  return os;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &a) {
  os << "{";
  bool was = false;
  for (auto &x : a) {
    if (was) {
      os << ", ";
    }
    was = true;
    os << x;
  }
  os << "}";
  return os;
}
template <typename T>
inline void debug(const char *sdbg, T x) {
  cerr << "The value of " << sdbg << " is " << x << "\n";
};
template <typename T, typename... U>
inline void debug(const char *sdbg, T h, U... t) {
  cerr << "The value of ";
  while (*sdbg != ',') {
    cerr << *sdbg++;
  }
  cerr << " is " << h << "\n";
  debug(sdbg + 1, t...);
  cerr << "\n";
}
template <typename T>
T abs(T x) {
  if (x < 0) {
    return -x;
  } else {
    return x;
  }
}
template <typename T>
T sqr(T x) {
  return x * x;
};
const long long INF_FOR_SHORT_TIME = (long long)(1e9);
template <typename T>
T mul(T a, T b, T m) {
  if (a <= INF_FOR_SHORT_TIME && b <= INF_FOR_SHORT_TIME) {
    return (a * b) % m;
  }
  T q = (long long)((long double)a * (long double)b / (long double)m);
  T r = a * b - q * m;
  return (r + 5 * m) % m;
}
template <typename T, typename U>
T binpow(T a, U n, T MOD) {
  T res = 1;
  while (n) {
    if (n & 1) {
      res = mul(res, a, MOD);
    }
    a = mul(a, a, MOD);
    n >>= 1;
  }
  return res;
};
template <typename T>
int sign(T x) {
  if (x < 0) {
    return -1;
  } else if (x > 0) {
    return 1;
  } else {
    return 0;
  }
};
template <typename T>
T gcd(T a, T b) {
  if (a > b) {
    swap(a, b);
  }
  while (a) {
    b %= a;
    swap(a, b);
  }
  return b;
};
template <typename T>
bool uin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
};
template <typename T>
bool uax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
};
void solve() {
  long long n;
  cin >> n;
  vector<long long> c(n, 0);
  vector<vector<long long>> p(n);
  for (long long i = 0; i < n; ++i) {
    long long mx, px;
    cin >> mx >> px;
    if (mx + 1 < n) c[mx + 1]++;
    p[mx].push_back(px);
  }
  for (long long i = 1; i < n; ++i) {
    c[i] += c[i - 1];
  }
  for (long long i = 0; i < n; ++i) {
    c[i] -= i;
  }
  long long ans = 0;
  long long buf = 0;
  multiset<long long> st;
  for (long long i = n - 1; i >= 0; --i) {
    for (auto x : p[i]) {
      st.insert(x);
    }
    while (c[i] + buf < 0) {
      ++buf;
      ans += *st.begin();
      st.erase(st.begin());
    }
  }
  cout << ans << "\n";
}
int main() {
  gen_rand.seed(time(0));
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
