Maximum Number of Balloons

September 19, 2019

Introduction

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 <= 10^4
    text consists of lower case English letters only.

Solution

func maxNumberOfBalloons(text string) int {
    cache := make([]int, 27)
    for _, ch := range text {
        i := ch - 'a'
        cache[i]++
    }
    cnt := 0
    s := "balloon"
    for {
        for _, ch := range s {
            i := ch - 'a'
            if cache[i] == 0 {
                return cnt
            }
            cache[i]--
        }
        cnt++
    }
    return cnt
}