Geeksforgeeks

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Given 3 strings A, B and C, the task is to find the longest common sub-sequence in all three given sequences.

**Example 1:**

**Input:**
A = "geeks", B = "geeksfor",
C = "geeksforgeeks"
**Output:** 5
**Explanation**: "geeks"is the longest common
subsequence with length 5.

â€‹**Example 2:**

**Input**:
A = "abcd", B = "efgh", C = "ijkl"
**Output:** 0
**Explanation**: There's no common subsequence
in all the strings.

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **LCSof3() **which takes the strings A, B, C and their lengths n1, n2, n3 as input and returns the length of the longest common subsequence in all the 3 strings.

**Expected Time Complexity: **O(n1*n2*n3).

**Expected Auxiliary Space: **O(n1*n2*n3).

**Constraints:**

1<=n1, n2, n3<=20

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LCS of three strings

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