Leetcode Problem 340. Longest Substring with At Most K Distinct Characters

340. Longest Substring with At Most K Distinct Characters

Leetcode Solutions

Sliding Window Approach

  1. Initialize a hash map counter to keep track of the frequency of each character within the window.
  2. Set left to 0 and max_size to 0.
  3. Iterate right from 0 to the length of the string s minus 1. a. Increment the frequency of s[right] in counter. b. While the number of distinct characters in counter is greater than k, increment left and decrement the frequency of s[left] in counter. If the frequency becomes 0, remove the character from counter. c. Update max_size to the maximum of its current value and the size of the current window (right - left + 1).
  4. Return max_size as the result.
UML Thumbnail

Binary Search + Fixed Size Sliding Window

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