Delete divide_and_conquer/Suffix Array and LCP implementation.py

divide_and_conquer/Suffix Array and LCP implementation.py

@@ -1,63 +0,0 @@
-class SuffixArray:
-    def __init__(self, input_string):
-        """
-        Initialize the SuffixArray with the input string and generate the suffix and LCP arrays.
-        """
-        self.input_string = input_string
-        self.suffix_array = self._create_suffix_array()
-        self.lcp_array = self._create_lcp_array()
-
-    def _create_suffix_array(self):
-        """
-        Create the suffix array for the given input string.
-        Returns the suffix array, which is a list of indices representing the starting positions of sorted suffixes.
-        """
-        length = len(self.input_string)
-        sorted_suffixes = sorted(range(length), key=lambda i: self.input_string[i:])
-        return sorted_suffixes
-
-    def _create_lcp_array(self):
-        """
-        Construct the LCP (Longest Common Prefix) array based on the suffix array.
-        LCP[i] stores the length of the longest common prefix between suffixes at suffix_array[i] and suffix_array[i-1].
-        """
-        length = len(self.input_string)
-        suffix_array = self.suffix_array
-        rank = [0] * length
-        lcp = [0] * length
-
-        # Generate the rank array where rank[i] indicates the position of the suffix starting at index i
-        for index, suffix in enumerate(suffix_array):
-            rank[suffix] = index
-
-        lcp_length = 0
-        for i in range(length):
-            if rank[i] > 0:
-                previous_suffix = suffix_array[rank[i] - 1]
-                while (i + lcp_length < length) and (previous_suffix + lcp_length < length) and \
-                        self.input_string[i + lcp_length] == self.input_string[previous_suffix + lcp_length]:
-                    lcp_length += 1
-                lcp[rank[i]] = lcp_length
-                if lcp_length > 0:
-                    lcp_length -= 1
-        return lcp
-
-    def display_arrays(self):
-        """
-        Print the suffix array and LCP array for the input string.
-        """
-        print("Suffix Array:")
-        for idx in self.suffix_array:
-            print(f"{idx}: {self.input_string[idx:]}")
-
-        print("\nLCP Array:")
-        for i in range(1, len(self.lcp_array)):
-            print(f"LCP between {self.input_string[self.suffix_array[i-1]:]} and {self.input_string[self.suffix_array[i]:]}: {self.lcp_array[i]}")
-
-# Example usage:
-if __name__ == "__main__":
-    input_text = "banana"
-    suffix_array_instance = SuffixArray(input_text)
-
-    # Show the suffix and LCP arrays
-    suffix_array_instance.display_arrays()