Formatted question description: https://leetcode.ca/all/1189.html
1189. Maximum Number of Balloons (Easy)
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.
Companies:
Wayfair
Related Topics:
Hash Table, String
Solution 1.
We can also use undered_map
which makes the code simpler. But I found it’s slower with unordered_map
.
// OJ: https://leetcode.com/problems/maximum-number-of-balloons/
// Time: O(N)
// Space: O(1)
class Solution {
public:
int maxNumberOfBalloons(string text) {
int cnt[26] = {0};
for (char c : text) cnt[c - 'a']++;
return min({ cnt['b' - 'a'], cnt['a' - 'a'], cnt['n' - 'a'],
cnt['l' - 'a'] / 2, cnt['o' - 'a'] / 2 });
}
};
Java
-
class Solution { public int maxNumberOfBalloons(String text) { int[] count = new int[26]; char[] array = text.toCharArray(); for (char c : array) count[c - 'a']++; int max = Integer.MAX_VALUE; max = Math.min(max, count['b' - 'a']); max = Math.min(max, count['a' - 'a']); max = Math.min(max, count['l' - 'a'] / 2); max = Math.min(max, count['o' - 'a'] / 2); max = Math.min(max, count['n' - 'a']); return max; } }
-
// OJ: https://leetcode.com/problems/maximum-number-of-balloons/ // Time: O(N) // Space: O(1) class Solution { public: int maxNumberOfBalloons(string text) { int cnt[26] = {0}; for (char c : text) cnt[c - 'a']++; return min({ cnt['b' - 'a'], cnt['a' - 'a'], cnt['n' - 'a'], cnt['l' - 'a'] / 2, cnt['o' - 'a'] / 2 }); } };
-
# 1189. Maximum Number of Balloons # https://leetcode.com/problems/maximum-number-of-balloons/ class Solution: def maxNumberOfBalloons(self, text: str) -> int: cnt = collections.Counter(text) return min(cnt["b"], cnt["a"], cnt["l"] // 2, cnt["o"] // 2, cnt["n"])