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Task: Complete the pattern, using the special character ■ □In this kata, we draw some h...

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Given a string s consists of upper/lower-case alphabets and empty space characters ' ',...

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Determine whether an integer is a palindrome. Do this without extra space. Solution:

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Reverse digits of an integer. Example1: Example2: Solution:

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Given an array of integers, return indices of the two numbers such that they add up to ...