toString() is not efficient #8
Description
Can you implement an efficient toString() function, whose time complecity is O(L), (L is the length of the final string). Direct concatation using '+' has O(L^2) time complexity.
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Can you implement an efficient toString() function, whose time complecity is O(L), (L is the length of the final string). Direct concatation using '+' has O(L^2) time complexity.