3713. Longest Balanced Substring I Medium

1/**
2 * [3713] Longest Balanced Substring I
3 *
4 * You are given a string s consisting of lowercase English letters.
5 * A <span data-keyword="substring-nonempty">substring</span> of s is called balanced if all distinct characters in the substring appear the same number of times.
6 * Return the length of the longest balanced substring of s.
7 *  
8 * <strong class="example">Example 1:
9 * <div class="example-block">
10 * Input: <span class="example-io">s = "abbac"</span>
11 * Output: <span class="example-io">4</span>
12 * Explanation:
13 * The longest balanced substring is "abba" because both distinct characters 'a' and 'b' each appear exactly 2 times.
14 * </div>
15 * <strong class="example">Example 2:
16 * <div class="example-block">
17 * Input: <span class="example-io">s = "zzabccy"</span>
18 * Output: <span class="example-io">4</span>
19 * Explanation:
20 * The longest balanced substring is "zabc" because the distinct characters 'z', 'a', 'b', and 'c' each appear exactly 1 time.​​​​​​​
21 * </div>
22 * <strong class="example">Example 3:
23 * <div class="example-block">
24 * Input: <span class="example-io">s = "aba"</span>
25 * Output: <span class="example-io">2</span>
26 * Explanation:
27 * ​​​​​​​One of the longest balanced substrings is "ab" because both distinct characters 'a' and 'b' each appear exactly 1 time. Another longest balanced substring is "ba".
28 * </div>
29 *  
30 * Constraints:
31 * 
32 * 	1 <= s.length <= 1000
33 * 	s consists of lowercase English letters.
34 * 
35 */
36pub struct Solution {}
37
38// problem: https://leetcode.com/problems/longest-balanced-substring-i/
39// discuss: https://leetcode.com/problems/longest-balanced-substring-i/discuss/?currentPage=1&orderBy=most_votes&query=
40
41// submission codes start here
42
43impl Solution {
44    pub fn longest_balanced(s: String) -> i32 {
45        0
46    }
47}
48
49// submission codes end
50
51#[cfg(test)]
52mod tests {
53    use super::*;
54
55    #[test]
56    fn test_3713() {
57    }
58}
59