Longest Substring with At Most Two Distinct Characters LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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In this post, you will find the solution for the Longest Substring with At Most Two Distinct Characters in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the ProblemLongest Substring with At Most Two Distinct Characters– LeetCode Problem

Longest Substring with At Most Two Distinct Characters– LeetCode Problem

Problem:

Given a string s , find the length of the longest substring t  that contains at most 2 distinct characters.

Example 1:

Input: "eceba"
Output: 3
Explanation: tis "ece" which its length is 3.

Example 2:

Input: "ccaabbb"
Output: 5
Explanation: tis "aabbb" which its length is 5.

Explanation

Two pointers. Keep faster pointer moving to the right until more than 2 distinct characters. Then adjust slower pointer and repeat the same.

Longest Substring with At Most Two Distinct Characters– LeetCode Solutions
Longest Substring with At Most Two Distinct Characters Solution in C++:
class Solution {
 public:
  int lengthOfLongestSubstringTwoDistinct(string s) {
    int ans = 0;
    int distinct = 0;
    vector<int> count(128);

    for (int l = 0, r = 0; r < s.length(); ++r) {
      if (++count[s[r]] == 1)
        ++distinct;
      while (distinct == 3)
        if (--count[s[l++]] == 0)
          --distinct;
      ans = max(ans, r - l + 1);
    }

    return ans;
  }
};
Longest Substring with At Most Two Distinct Characters Solution in Java:
class Solution {
  public int lengthOfLongestSubstringTwoDistinct(String s) {
    int ans = 0;
    int distinct = 0;
    int[] count = new int[128];

    for (int l = 0, r = 0; r < s.length(); ++r) {
      if (++count[s.charAt(r)] == 1)
        ++distinct;
      while (distinct == 3)
        if (--count[s.charAt(l++)] == 0)
          --distinct;
      ans = Math.max(ans, r - l + 1);
    }

    return ans;
  }
}
Longest Substring with At Most Two Distinct Characters Solution in Python:
class Solution:
  def lengthOfLongestSubstringTwoDistinct(self, s: str) -> int:
    ans = 0
    distinct = 0
    count = [0] * 128

    l = 0
    for r, c in enumerate(s):
      count[ord(c)] += 1
      if count[ord(c)] == 1:
        distinct += 1
      while distinct == 3:
        count[ord(s[l])] -= 1
        if count[ord(s[l])] == 0:
          distinct -= 1
        l += 1
      ans = max(ans, r - l + 1)

    return ans

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