maximum occurred integer in n ranges

maxOccurredIntegerInNRanges.cpp

int main() {
  int Q; cin >> Q;
  map<long long, int> points;
  for (int i = 0; i < Q; i++) {
    long long l, r; cin >> l >> r;
    points[l]++;
    points[r + 1]--;
  }

  int best = 0, cur = 0;
  for (pair<long long, int> x: points) {
    cur += x.second;
    best = max(best, cur);
  }
  cout << best << '\n';
}