Find Longest Special Substring That Occurs Thrice II - Solution & Explanation

In this approach, we traverse through the string while keeping track of the maximum length of 'special' substrings (repeating characters) using a map to store occurrences. We match and compare these substrings to ensure they appear at least three times in the original string and track the maximum possible length that satisfies these conditions. Use a map or array to count substrings efficiently.

The implementation partitions the string into potential special substrings, counts each segment as it traverses, and checks subsequential matches of single characters substring. Using an integer array, we captured the longest reachable substring length that appears at least three times. The final answer represents the maximum such valid substring.

This approach leverages the sliding window pattern with an added dynamic counting mechanism to find potential substrings that recur thrice, making sure to handle easy reset and expansion of the window by simply expanding or shrinking based on repetition within the window. The algorithm attempts to incrementally build substrings while reverting or advancing the primary indx controller through appropriately bounded checks.

This C program navigates through the string using a sliding window approach where each window attempts to capture conjunct repeated characters limited to three-time minimal requirements. For each triple detection, progress through the string resets within conditions allowing consecutive suffix captures up to further elongation where potential and maximum length are constantly updated.