message: Update merge-k-sorted-lists.cpp
diff: @@ -20,12 +20,11 @@ public:
  int left = 0, right = lists.size() - 1;
  while (right > 0) {
  - if (left >= right) {
  - left = 0;
  - } else {
  lists[left] = mergeTwoLists(lists[left], lists[right]);
  ++left;
  --right;
  + if (left >= right) {
  + left = 0;
  }
  }
  return lists[0];
  