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FOFortunatus Olorunsolafortunatus-notes.hashnode.devAug 9 · 10 min read

Solving 1920: how to store 2 numbers in 1

Check out the problem here. The first and obvious solution to this problem is even in the question: ans[i] = nums[nums[i]]. You loop over the nums array and in each iteration, you just put whatever nu

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FOFortunatus Olorunsolafortunatus-notes.hashnode.devAug 9 · 3 min read

Where Elegant Solutions Actually Come From

Here's a problem for you: add up every number from 1 to 100. Take a sec. How would you do it? Did you go for the obvious approach: start at 1, add 2, add 3, and keep going until 100? I understand. It'

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DSDoogal Simpsondoogal.devMar 3 · 5 min read

Why Doing Nothing is Mathematically Your Fastest Debugging Tool

Sometimes the solution to the hardest problem you're working on is found by just going and having a shower. It's mathematically the fastest way to debug because it shifts your brain from focus mode in

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devDec 1, 2025 · 2 min read

Problem: Leet Code 2733 - Numbers That Are Not Min or Max

Given an integer array nums containing distinct positive integers, find and return any number from the array that is neither the minimum nor the maximum value in the array, or -1 if there is no such number. Return the selected integer. Example 1: Inp...

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devNov 28, 2025 · 2 min read

Problem: Leet Code 217-Contains Duplicate

QUESTION: Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Example 1: Input: nums = [1,2,3,1] Output: true Explanation: The element 1 occurs at the indices 0 a...

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devNov 2, 2025 · 2 min read

Checkout the way to Reverse an Array

You are given an array of integers arr[]. You have to reverse the given array. Note: Modify the array in place. Examples: Input: arr = [1, 4, 3, 2, 6, 5] Output: [5, 6, 2, 3, 4, 1] Explanation: The elements of the array are [1, 4, 3, 2, 6, 5]. After ...

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devOct 20, 2025 · 2 min read

Simple Guide to Finding Array Min and Max Values

Given an array arr[]. Your task is to find the minimum and maximum elements in the array. Examples: Input: arr[] = [1, 4, 3, -5, -4, 8, 6] Output: [-5, 8] Explanation: minimum and maximum elements of array are -5 and 8. Input: arr[] = [12, 3, 15, 7,...

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devOct 11, 2025 · 3 min read

Problem: Leet Code 342-Power of Four

Given an integer n, return true if it is a power of four. Otherwise, return false. An integer n is a power of four, if there exists an integer x such that n == 4<sup>x</sup>. Example 1: Input: n = 16 Output: true Example 2: Input: n = 5 Output: fals...

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devOct 10, 2025 · 3 min read

Problem: Leet Code 326-Power of Three

Given an integer n, return true if it is a power of three. Otherwise, return false. An integer n is a power of three, if there exists an integer x such that n == 3<sup>x</sup>. Example 1: Input: n = 27 Output: true Explanation: 27 = 33 Example 2: In...

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AGARCHANA GURUSAMYarchana-code-diary.hashnode.devOct 7, 2025 · 3 min read

Problem: Leet Code 69-Sqrt(x)

QUESTION: Given a non-negative integer x, return the square root of x rounded down to the nearest integer. The returned integer should be non-negative as well. You must not use any built-in exponent function or operator. For example, do not use pow(...

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Trending tags this week

Solving 1920: how to store 2 numbers in 1

Where Elegant Solutions Actually Come From

Why Doing Nothing is Mathematically Your Fastest Debugging Tool

Problem: Leet Code 2733 - Numbers That Are Not Min or Max

Problem: Leet Code 217-Contains Duplicate

Checkout the way to Reverse an Array

Simple Guide to Finding Array Min and Max Values

Problem: Leet Code 342-Power of Four

Problem: Leet Code 326-Power of Three

Problem: Leet Code 69-Sqrt(x)