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 ## Pystrings
   * Anagram
+    * Count Anagrams
+      * [Test Count Anagrams](https://github.com/BrianLusina/PythonSnips/blob/master/pystrings/anagram/count_anagrams/test_count_anagrams.py)
     * Group Anagrams
       * [Test Group Anagrams](https://github.com/BrianLusina/PythonSnips/blob/master/pystrings/anagram/group_anagrams/test_group_anagrams.py)
     * [Test Anagram](https://github.com/BrianLusina/PythonSnips/blob/master/pystrings/anagram/test_anagram.py)
diff --git a/pystrings/anagram/count_anagrams/README.md b/pystrings/anagram/count_anagrams/README.md
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+# Count Anagrams
+
+You are given a string s containing one or more words. Every consecutive pair of words is separated by a single space ' '.
+
+A string t is an anagram of string s if the `ith` word of t is a permutation of the `ith` word of s.
+
+For example, "acb dfe" is an anagram of "abc def", but "def cab" and "adc bef" are not.
+Return the number of distinct anagrams of s. Since the answer may be very large, return it modulo 10^9 + 7.
+
+## Examples
+
+Example 1:
+
+```text
+Input: s = "too hot"
+Output: 18
+Explanation: Some of the anagrams of the given string are "too hot", "oot hot", "oto toh", "too toh", and "too oht".
+```
+
+Example 2:
+
+```text
+Input: s = "aa"
+Output: 1
+Explanation: There is only one anagram possible for the given string.
+```
+
+## Constraints
+
+- 1 <= s.length <= 105
+- s consists of lowercase English letters and spaces ' '.
+- There is single space between consecutive words.
+
+## Topics
+
+- Hash Table
+- Math
+- String
+- Combinatorics
+- Counting
+
+## Hints
+
+- For each word, can you count the number of permutations possible if all characters are distinct?
+- How to reduce overcounting when letters are repeated? 
+- The product of the counts of distinct permutations of all words will give the final answer.
+
+## Solution
+
+An anagram of the entire string means that each word can be rearranged independently, but the order of the words stays
+the same. This implies that we can find a string’s total number of distinct anagrams by calculating how many valid
+permutations exist for each word. The number of permutations for each word depends on its length and the frequency of its
+letters. By multiplying all words’ permutations, we get the total number of distinct anagrams for the whole string.
+
+![Illustration 1](./images/solutions/count_anagrams_illustration_1.png)
+
+Let’s explore a few optimizations we can apply to avoid these issues.
+
+- **Precompute factorials**: Calculating factorials repeatedly for each word is very slow. Precompute factorials up to the
+  maximum length (1000) to make these calculations faster. This is because it allows us to quickly access the precomputed
+  values later.
+- **Take modular inverses**: As mentioned in the problem statement, we need to use 10^9 +7 modulo when computing factorial
+  values. This prevents integer overflow and keeps the numbers manageable as factorials grow extremely fast. It is easier
+  to use modulo when computing permutations of words with no duplicate characters, but it becomes challenging when we have
+  words with duplicate characters. This is because a division is involved `(n! / (c1! * c2!*...))` Normal division isn’t
+  allowed in modular arithmetic, so we use the modular inverse instead. This will allow us to perform division by
+  converting it into multiplication. Therefore, when precomputing factorials, we also precompute their modular inverses,
+  i.e. c1!^-1, c2!^-1, c3!^-1 using Fermat’s theorem.
+
+> **Fermat’s Little theorem** states that if p is a prime number and a is an integer not divisible by p, then we we get
+> the modular inverse of a as follows:
+> a^-1 ≡ a^(p-2) mod p
+> In our case, MOD = 10^9 +7 (a prime number), and we need modular inverses of c1!, c2!, c3! and so on, so the modular
+> inverse of cx! is computed as:
+> cx^-1 ≡ cx^(MOD-2) mod MOD
+
+In the example illustration above, the final answer becomes a more manageable number after applying the modulo operation.
+
+![Illustration 2](./images/solutions/count_anagrams_illustration_2.png)
+
+Let’s look at the algorithm steps of this solution:
+
+- **Set up the constants and variables**:
+  - We define a large prime number, MOD = 10**9 + 7, to keep calculations manageable.
+  - We define a variable, MAX_LEN = 1000, representing the maximum possible word length. The length of any word will not
+    exceed 1000.
+  - We create two lists, factorials and invFactorials, to store precomputed values that make calculations faster later.
+  - We create a variable, result, to store the final result.
+- **Precompute factorials and inverse factorials**: This step is done once at the start to speed things up later. A
+  function preCompute() is used to:
+  - Compute the factorials for all numbers up to MAX_LEN using the preCompute function.
+  - Compute the modular inverse of these factorials (used for division in modular arithmetic). First, the modular inverse
+    of factorials[MAX_LEN] is computed. Then, we calculate the inverse factorial for all numbers down to 1 using this.
+  - Store them in lists, factorials and invFactorials, so we don’t have to recompute them every time.
+- **Count permutations for each word**: The function countPermutations(word) calculates how many unique ways we can rearrange
+  a word. It uses the precomputed factorials and inverse factorials for fast calculations.
+  - First, it counts how many times each letter appears in the word, letter_count.
+  - Then, it calculates the number of ways to arrange the letters, total_permutations.
+  - If a letter repeats, it adjusts the count to avoid counting the same arrangement multiple times.
+- **Count anagram groups in a sentence**: The function countAnagrams(s) works as follows:
+  - It splits the sentence into words, words.
+  - It finds the unique arrangements for each word using countPermutations(word).
+  - It multiplies and stores all the results together in result to get the total number of anagram groups.
+  - After processing all words, return the total number of valid anagrams of the entire string result.
+
+### Time Complexity
+
+Let’s break down and analyze the time complexity of this solution:
+
+- **Precomputation step**: This step takes O(n) time, where n = MAX_LEN (the maximum possible word length in the input string
+  s). Let’s see how:
+  - **Factorials calculation**: Computing factorials for all numbers up to MAX_LEN takes O(n) time.
+  - **Inverse factorials calculation**: Calculating inverse factorials in a backward loop also takes O(n).
+- **Processing each word:** This step takes O(m) time, where m is the length of the word. Let’s see how:
+  - Counting characters for each word takes O(m) time.
+  - **Calculating permutations for each word**: We loop over character counts (at most 26 for lowercase English letters),
+    which takes O(1).
+  - **Modular multiplications**: This takes O(1) per operation.
+- Iterating through all words: Let L represent the total length of the input string. As we split the input into words and
+  process each word, this takes O(L).
+
+If we sum these up, the overall time complexity simplifies to:
+
+`O(n) + O(m) + O(L) = O(n+L)`
+
+### Space Complexity
+
+Let’s break down and analyze the space complexity of this solution:
+
+- **Factorials array**: It stores factorials from 0 to MAX_LEN, so the space required is O(n).
+- **Inverse factorials array**: It stores modular inverses of factorials from 0 to MAX_LEN, so the space required is O(n)
+
+As no additional significant space is used during the calculations, the total space complexity becomes:
+
+`O(n) + O(n) = O(n)`
diff --git a/pystrings/anagram/count_anagrams/__init__.py b/pystrings/anagram/count_anagrams/__init__.py
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+from typing import Counter
+from collections import Counter
+
+
+def count_anagrams(s: str) -> int:
+    # Define modulo constant for large number calculations
+    mod = 10**9 + 7
+    # Define maximum possible word length
+    max_len = 10**5
+
+    # Arrays to store precomputed factorials and their modular inverses
+    factorials = [1] * (max_len + 1)
+    inv_factorials = [1] * (max_len + 1)
+
+    def pre_compute():
+        """
+        Precomputes factorials and their modular inverses using Fermat's theorem.
+        This allows efficient computation of permutations involving repeated characters
+        """
+        # Compute factorials modulo MOD
+        factorials[0] = 1
+        for i in range(2, max_len + 1):
+            factorials[i] = factorials[i - 1] * i % mod
+
+        # Compute modular inverse of MAX_LEN! using Fermat's Little Theorem
+        inv_factorials[max_len] = pow(factorials[max_len], mod - 2, mod)
+
+        # Compute modular inverses for all numbers from MAX_LEN-1 down to 1
+        for i in range(max_len - 1, 0, -1):
+            inv_factorials[i] = inv_factorials[i + 1] * (i + 1) % mod
+
+    def count_permutations(w: str) -> int:
+        """
+        Computes the number of distinct permutations of a given word, considering repeated characters
+        """
+        # Count occurrences of each character
+        letter_count: Counter = Counter(w)
+
+        # Compute n! for total characters
+        total_permutations = factorials[len(w)]
+
+        # Divide by factorial of each character count to account for duplicates
+        for freq in letter_count.values():
+            total_permutations = (total_permutations * inv_factorials[freq]) % mod
+
+        return total_permutations
+
+    result = 1
+    pre_compute()
+    words = s.split()
+
+    # Multiply the permutations of each word to get the final count
+    for word in words:
+        result = (result * count_permutations(word)) % mod
+
+    return result
diff --git a/pystrings/anagram/count_anagrams/images/solutions/count_anagrams_illustration_1.png b/pystrings/anagram/count_anagrams/images/solutions/count_anagrams_illustration_1.png
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diff --git a/pystrings/anagram/count_anagrams/test_count_anagrams.py b/pystrings/anagram/count_anagrams/test_count_anagrams.py
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+import unittest
+from parameterized import parameterized
+from pystrings.anagram.count_anagrams import count_anagrams
+
+COUNT_ANAGRAMS_TEST_CASES = [
+    ("too hot", 18),
+    ("aa", 1),
+    ("all good", 36),
+    ("a a a b b", 1),
+    ("hello world", 7200),
+    ("excel", 60),
+    ("ab ab cd cd ef ef", 64),
+]
+
+
+class CountAnagramsTestCase(unittest.TestCase):
+    @parameterized.expand(COUNT_ANAGRAMS_TEST_CASES)
+    def test_count_anagrams(self, s: str, expected: int):
+        actual = count_anagrams(s)
+        self.assertEqual(expected, actual)
+
+
+if __name__ == "__main__":
+    unittest.main()