i want to enhance your tribonnaci by dp code for readibility

[wasiiiii76]

these are things which i want to change
Use a Vector Instead of a Map: Since you know the indices (0 to n), using a vector can be more efficient than a map for memoization.

Add Base Cases Directly: You can handle the base cases directly in the calc function to make it cleaner.

Iterative Approach: You can implement the Tribonacci sequence iteratively, which avoids recursion overhead and is generally easier to understand.

Input Validation: Add some validation for user input to handle negative numbers or non-integer values.

[Pavishkumar1]

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