message: Update find-closest-number-to-zero.cpp
diff: class Solution {
  public:
  int findClosestNumber(vector<int>& nums) {
  - int result = numeric_limits<int>::max();
  - for (const auto& x : nums) {
  - if (abs(x) < abs(result) || (abs(x) == abs(result) && x > result)) {
  - result = x;
  - }
  - }
  - return result;
  + return *max_element(cbegin(nums), cend(nums),
  + [](const auto& x, const auto& y) {
  + return make_pair(-abs(x), x) < make_pair(-abs(y), y);
  + });
  }
  };
  