Given a string text, you want to use the characters
of text to form as many instances of the word "balloon"
as possible.
You can use each character in text at most once. Return the
maximum number of instances that can be formed.
Example 1:
Input: text = "nlaebolko" Output: 1
Example 2:
Input: text = "loonbalxballpoon" Output: 2
Example 3:
Input: text = "leetcode" Output: 0
Constraints:
1 <= text.length <= 10^4text consists of lower case English letters only.