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Series
In this series, I will explain all the logic I've developed in problems on LeetCode.
My code seems to be little bit more complex than the solution provided. I feel like I could have done it more efficiently, so the thing I’ve realized is that I need more time and practice to make myself a good thinker. I’ve struggled because of the f...
Sliding Window & Two Pointers
Palindromic Substring is the string which reads the same forward and backward. ex) aba, noon, level, rotor Brainstorming Thinking Process Should I use two pointers for this problem? I need 3 nested for/while loops. …We can think of one letter which h...
Here is the problem: https://leetcode.com/problems/zigzag-conversion/description/ Brainstorming Thinking Process First method that went through my mind was using an array. But since the maximum length of input string is 1,000 and maximum number of ro...
The problem I solved today was very simple that I finished it within 10 minutes. It becomes much easier if you’re using Python, because it is very easy to cast from int to str or str to int. Also, you can simply reverse the string pythonically like s...
Brainstorming Thinking Process It was very confusing that there were at least 4 restrictions I had to think of. Two cases are different: “-042” and "0-1". If “-” comes first, the next zeros can be ignored. If “0” comes first, even though the next cha...