message: Update count-the-hidden-sequences.cpp
diff: @@ -6,8 +6,8 @@ class Solution {
  public:
  int numberOfArrays(vector<int>& differences, int lower, int upper) {
  int64_t total = 0, mn = 0, mx = 0;
  - for (const auto& d : differences) {
  - total += d;
  + for (const auto& x : differences) {
  + total += x;
  mn = min(mn, total);
  mx = max(mx, total);
  }
  