message: Update excel-sheet-column-number.cpp
diff: @@ -15,11 +15,10 @@ public:
  // Time: O(n)
  // Space: O(1)
  -
  class Solution2 {
  public:
  int titleToNumber(string s) {
  - return accumulate(s.begin(), s.end(), 0,
  + return accumulate(s.cbegin(), s.cend(), 0,
  [](int sum, char c) {
  return sum * 26 + c - 'A' + 1;
  });
  