--- title: "#problemsolving articles | Hashnode" description: "Explore 16 articles tagged #problemsolving on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/problemsolving" --- Tag # #problemsolving 16 posts · 0 followers [Fortunatus Olorunsola](https://hashnode.com/@whatisnatus27) · [Aug 9](https://hashnode.com/posts/solving-1920-how-to-store-2-numbers-in-1/6a78721e1c5680ecc81f7d54) ### [Solving 1920: how to store 2 numbers in 1](https://fortunatus-notes.hashnode.dev/solving-1920-how-to-store-2-numbers-in-1?utm_source=hashnode&utm_medium=feed) For LeetCode 1920, an O(n) solution wasn't good enough. It wanted O(1) space. Here's the math trick (quotients & remainders) that makes it work. 10 min read · [fortunatus-notes.hashnode.dev](https://fortunatus-notes.hashnode.dev/solving-1920-how-to-store-2-numbers-in-1?utm_source=hashnode&utm_medium=feed) [Fortunatus Olorunsola](https://hashnode.com/@whatisnatus27) · [Aug 9](https://hashnode.com/posts/where-elegant-solutions-actually-come-from/6a78510e70177fea1851672e) ### [Where Elegant Solutions Actually Come From](https://fortunatus-notes.hashnode.dev/where-elegant-solutions-actually-come-from?utm_source=hashnode&utm_medium=feed) Why elegant solutions sting when you miss them — and why learning what's already discovered frees you to chase what isn't yet. 3 min read · [fortunatus-notes.hashnode.dev](https://fortunatus-notes.hashnode.dev/where-elegant-solutions-actually-come-from?utm_source=hashnode&utm_medium=feed) [Doogal Simpson](https://hashnode.com/@doogal) · [Mar 3](https://hashnode.com/posts/why-doing-nothing-is-mathematically-your-fastest-debugging-tool/69a6d28e75d7a0f1001854d5) ### [Why Doing Nothing is Mathematically Your Fastest Debugging Tool](https://doogal.dev/why-doing-nothing-is-mathematically-your-fastest-debugging-tool?utm_source=hashnode&utm_medium=feed) Stuck on a bug? Learn how diffuse mode thinking helps you solve complex code problems by stepping away from the keyboard. Sometimes doing nothing is the fastest fix. 5 min read · [doogal.dev](https://doogal.dev/why-doing-nothing-is-mathematically-your-fastest-debugging-tool?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Dec 1, 2025](https://hashnode.com/posts/problem-solved-leet-code-2733-numbers-that-are-not-min-or-max/692d324c8ee03851b49a06e1) ### [Problem: Leet Code 2733 - Numbers That Are Not Min or Max](https://archana-code-diary.hashnode.dev/problem-solved-leet-code-2733-numbers-that-are-not-min-or-max?utm_source=hashnode&utm_medium=feed) Unveiling a simple approach to locate elements that aren't the minimum or maximum 2 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/problem-solved-leet-code-2733-numbers-that-are-not-min-or-max?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Nov 28, 2025](https://hashnode.com/posts/problem-leet-code-217-contains-duplicate/6929783ff66043e8317f95ca) ### [Problem: Leet Code 217-Contains Duplicate](https://archana-code-diary.hashnode.dev/problem-leet-code-217-contains-duplicate?utm_source=hashnode&utm_medium=feed) Explore a basic approach to detect duplicate entries in an array. 2 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/problem-leet-code-217-contains-duplicate?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Nov 2, 2025](https://hashnode.com/posts/checkout-the-way-to-reverse-an-array/69073006184eb480a97548b3) ### [Checkout the way to Reverse an Array](https://archana-code-diary.hashnode.dev/checkout-the-way-to-reverse-an-array?utm_source=hashnode&utm_medium=feed) Master the In-Place Array Reversal with This Wise Guide 2 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/checkout-the-way-to-reverse-an-array?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Oct 20, 2025](https://hashnode.com/posts/simple-guide-to-finding-array-min-and-max-values/68f66842aed8864c4305bc0d) ### [Simple Guide to Finding Array Min and Max Values](https://archana-code-diary.hashnode.dev/simple-guide-to-finding-array-min-and-max-values?utm_source=hashnode&utm_medium=feed) Efficiently determine min and max in arrays with this technique. 2 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/simple-guide-to-finding-array-min-and-max-values?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Oct 11, 2025](https://hashnode.com/posts/problem-leet-code-342-power-of-four/68ea274dec2eae0988376a52) ### [Problem: Leet Code 342-Power of Four](https://archana-code-diary.hashnode.dev/problem-leet-code-342-power-of-four?utm_source=hashnode&utm_medium=feed) Uncover helpful tips to identify a number as a power of 4 3 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/problem-leet-code-342-power-of-four?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Oct 10, 2025](https://hashnode.com/posts/problem-leet-code-326-power-of-three/68e88e4d57244244fe3aa9cd) ### [Problem: Leet Code 326-Power of Three](https://archana-code-diary.hashnode.dev/problem-leet-code-326-power-of-three?utm_source=hashnode&utm_medium=feed) Discover techniques to verify if a number is power of three 3 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/problem-leet-code-326-power-of-three?utm_source=hashnode&utm_medium=feed) [ARCHANA GURUSAMY](https://hashnode.com/@archana-dev) · [Oct 7, 2025](https://hashnode.com/posts/problem-leet-code-69-sqrtx/68e4a990cd1ff7dec0c1c689) ### [Problem: Leet Code 69-Sqrt(x)](https://archana-code-diary.hashnode.dev/problem-leet-code-69-sqrtx?utm_source=hashnode&utm_medium=feed) Find out how to easily solve for the square root of any non-negative number. 3 min read · [archana-code-diary.hashnode.dev](https://archana-code-diary.hashnode.dev/problem-leet-code-69-sqrtx?utm_source=hashnode&utm_medium=feed)