life is too short for a diary

In this [leetcode](https://leetcode.com/problems/longest-substring-without-repeating-characters/) problem, we are asked to find the length of the longest string of characters in a provided string that does not contain repeating characters. In other words, in the string `abcabcbb` the longest substring without repeating characters is `abc` (with a length of 3)...

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Ternary string is an interesting problem that could be solved using two pointers techniques. It's a convenient way to keep track of multiple indices. This helps in making decisions based on two values...

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Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero...

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