diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..f257eb9 --- /dev/null +++ b/.gitignore @@ -0,0 +1,110 @@ +# Logs +logs +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +lerna-debug.log* + +# Diagnostic reports (https://nodejs.org/api/report.html) +report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json + +# Runtime data +pids +*.pid +*.seed +*.pid.lock + +# Directory for instrumented libs generated by jscoverage/JSCover +lib-cov + +# Coverage directory used by tools like istanbul +coverage +*.lcov + +# nyc test coverage +.nyc_output + +# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) +.grunt + +# Bower dependency directory (https://bower.io/) +bower_components + +# node-waf configuration +.lock-wscript + +# Compiled binary addons (https://nodejs.org/api/addons.html) +build/Release + +# Dependency directories +node_modules/ +jspm_packages/ + +# TypeScript v1 declaration files +typings/ + +# TypeScript cache +*.tsbuildinfo + +# Optional npm cache directory +.npm + +# Optional eslint cache +.eslintcache + +# Microbundle cache +.rpt2_cache/ +.rts2_cache_cjs/ +.rts2_cache_es/ +.rts2_cache_umd/ + +# Optional REPL history +.node_repl_history + +# Output of 'npm pack' +*.tgz + +# Yarn Integrity file +.yarn-integrity + +# dotenv environment variables file +.env +.env.test + +# parcel-bundler cache (https://parceljs.org/) +.cache + +# Next.js build output +.next + +# Nuxt.js build / generate output +.nuxt +dist + +# Gatsby files +.cache/ +# Comment in the public line in if your project uses Gatsby and *not* Next.js +# https://nextjs.org/blog/next-9-1#public-directory-support +# public + +# vuepress build output +.vuepress/dist + +# Serverless directories +.serverless/ + +# FuseBox cache +.fusebox/ + +# DynamoDB Local files +.dynamodb/ + +# TernJS port file +.tern-port + +# Node Modules +.node_module + +# Visual Studio Code +.vscode \ No newline at end of file diff --git a/README.md b/README.md index 15b4a30..fc88b11 100644 --- a/README.md +++ b/README.md @@ -1,14 +1,11 @@ +# Sorting Algorithms -## Algorithms & Data structures - using JavaScript - - My lab works of Algorithms classes as a student of Computer Science(Internet of Things) program in Lviv Polytechnic National University. - ---- - -1. __Sort algorithms__ and their analysis -2. **Data structures** and their functionality -3. Solve Math **Problem** -4. **Graphs** -5. **More Graphs**: Prim's (also known as Jarník's algorithm) minimum spanning tree, Kruskal's effective minimum spanning tree, Tarjan's strongly connected components -6. Solve **Dynamic Programming** Problem -7. **String search algorithms:** Knuth–Morris–Pratt, Rabin–Karp, Boyer–Moore + ### Simple + + Bubble + + Insertion + + Selection + + ### Advanced + + Merge + + Heap + + Quick diff --git a/bubble/bubblesort.js b/bubble/bubblesort.js new file mode 100644 index 0000000..d0f85af --- /dev/null +++ b/bubble/bubblesort.js @@ -0,0 +1,20 @@ +let bubbleSort = (arr) => { + let len = arr.length; + let swapped; + + do { + swapped = false; + for (let i = 0; i < len; i++) { + if(arr[i] > arr[i + 1]) { + let tmp = arr[i]; // store var to swap + arr[i] = arr[i + 1]; // swap + arr[i + 1] = tmp; // swap + swapped = true; + } + } + } while(swapped); + + return arr; +} + +console.log("\nsort result: ", bubbleSort([2, 3, 5, 4, 1]), "\n"); diff --git a/heap/README.md b/heap/README.md new file mode 100644 index 0000000..3644da7 --- /dev/null +++ b/heap/README.md @@ -0,0 +1,31 @@ +# Lab-1 + +--- + +## Task +Implement a sorting algorithm - HeapSort(ascending/descending) + +Visual presentation + +![Algorithm's gif](https://upload.wikimedia.org/wikipedia/commons/1/1b/Sorting_heapsort_anim.gif) + +--- + + ### Result output + + Algorithm's name + + Execution time + + Counters: swaps, comparisons + + Sorting result + ### Code must be covered with tests + + sort the input array + + sort in ascending order of sorted array in ascending order + + sort in descending order of sorted array in ascending order + + sort in ascending order of sorted array in descending order + + sort in descending order of sorted array in descending order + +--- + +## Installation + + Download the project and open index.html file + + Click right mouse button and select "Inspect" + + Print `heapSort(inputArray)` in console and press Enter *(inputArray example: [2, 5, 7, -9, 0])* diff --git a/heap/heapsort.js b/heap/heapsort.js new file mode 100644 index 0000000..5f06a2a --- /dev/null +++ b/heap/heapsort.js @@ -0,0 +1,111 @@ +import { performance } from 'perf_hooks'; + +export function heapifyMax(arr, length, i, counter = { comparisons: 0, swaps: 0, executionTime: 0 }) { + let largest = i; //i - index of the parent that we are heapifying + let left = i * 2 + 1; + let right = left + 1; + + + counter.comparisons++; + if (left < length) { + counter.comparisons++; //for next 'if' + if(arr[left] > arr[largest]) { + largest = left; + } + } + + counter.comparisons++; + if (right < length) { + counter.comparisons++; //for next 'if' + if(arr[right] > arr[largest]) { + + largest = right; + } + } + + if(largest != i) { + counter.swaps++; + [arr[i], arr[largest]] = [arr[largest], arr[i]]; + heapifyMax(arr, length, largest, counter); + } +} + +export function heapifyMin(arr, length, i, counter = { comparisons: 0, swaps: 0, executionTime: 0 }) { + let largest = i; + let left = i * 2 + 1; + let right = left + 1; + + + counter.comparisons++; + if (left < length) { + counter.comparisons++; //for next 'if' + if(arr[left] < arr[largest]) { + largest = left; + } + } + + counter.comparisons++; + if (right < length) { + counter.comparisons++; //for next 'if' + if(arr[right] < arr[largest]) { + + largest = right; + } + } + + if(largest != i) { + counter.swaps++; + [arr[i], arr[largest]] = [arr[largest], arr[i]]; + heapifyMin(arr, length, largest, counter); + } +} + +export function heapSort(arr, sortOrder = "asc") { + const startTime = performance.now(); + let length = arr.length; + let i = Math.floor(length / 2 - 1); //last parent node + let k = length - 1; // last child + + let counter = { + comparisons: 0, + swaps: 0 + } + + if(sortOrder === "asc" ) { + while (i >= 0) { + heapifyMax(arr, length, i, counter); + i--; + } + + while (k >= 0) { + counter.swaps++; + [arr[0], arr[k]] = [arr[k], arr[0]]; + heapifyMax(arr, k, 0, counter); + k--; + } + } else if (sortOrder === "desc") { + while (i >= 0) { + heapifyMin(arr, length, i, counter); + i--; + } + + while (k >= 0) { + counter.swaps++; + [arr[0], arr[k]] = [arr[k], arr[0]]; + heapifyMin(arr, k, 0, counter); + k--; + } + } else { + console.log("Wrong sort order"); + } + + + const endTime = performance.now(); + counter.executionTime = endTime - startTime; + console.log("HeapSort"); + console.log("Sorted Array:", ...arr); + console.log("counters:", counter); + return arr; +} + +heapSort([5, 3, 4, 3, 1]); \ No newline at end of file diff --git a/insertion/insertionSort.js b/insertion/insertionSort.js new file mode 100644 index 0000000..0122fb4 --- /dev/null +++ b/insertion/insertionSort.js @@ -0,0 +1,22 @@ +// +// sub-list before key is sorted +// +const insertionSort = (arr) => { + let len = arr.length; + + for(let i = 1; i < len; i++) { + let key = arr[i]; // current key + let j = i - 1; // last element of sorted sub-list + + while(j >= 0 && arr[j] > key) { + arr[j + 1] = arr[j]; // swap + j = j - 1; // iterate through sub-list + } + + arr[j + 1] = key; // next key is right of the biggest value in sub-list + } + + return console.log('\nsort result: ', arr, "\n"); +} + +insertionSort([5, 1, 2, -3, -4, 5, -5, 10, 23, -23]); diff --git a/merge/mergeSort.js b/merge/mergeSort.js new file mode 100644 index 0000000..67225d8 --- /dev/null +++ b/merge/mergeSort.js @@ -0,0 +1,27 @@ +const merge = (left, right) => { + let arr = []; + + while(left.length && right.length) { + if(left[0] < right[0]) { + arr.push(left.shift()); + } else { + arr.push(right.shift()); + } + } + + return [...arr, ...left, ...right] +} + +const mergeSort = (arr) => { + const half = arr.length / 2; + + if(arr.length < 2) { + return arr; + } + + const left = arr.splice(0, half); + const right = arr; + return merge(mergeSort(left), mergeSort(right)); +} + +console.log("\nsort result: ", mergeSort([5, 2, 3, 1, 7, 6]), "\n"); diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..8b230cf --- /dev/null +++ b/package-lock.json @@ -0,0 +1,623 @@ +{ + "name": "sort-algorithms", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { 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b/package.json @@ -0,0 +1,25 @@ +{ + "name": "sort-algorithms", + "version": "1.0.0", + "type": "module", + "description": "implementation of must popular sorting algorithms with JavaScript(ES6+)", + "main": "main.js", + "scripts": { + "heapsortTest": "mocha tests/heapsortTest.js" + }, + "repository": { + "type": "git", + "url": "https://github.com/Wordllban/iotalgo" + }, + "keywords": [ + "Algorithms", + "Sorting", + "JavaScript" + ], + "author": "Mininkov K.M.", + "license": "MIT", + "dependencies": { + "chai": "^4.3.4", + "mocha": "^9.1.3" + } +} diff --git a/quick/quickSort.js b/quick/quickSort.js new file mode 100644 index 0000000..794c529 --- /dev/null +++ b/quick/quickSort.js @@ -0,0 +1,25 @@ +function quickSort(arr) { + if (arr.length < 2) { + return arr; + } + + const pivot = arr[Math.floor(Math.random() * arr.length)]; + + let left = []; + let right = []; + let equal = []; + + for (let val of arr) { + if (val < pivot) { + left.push(val); + } else if (val > pivot) { + right.push(val); + } else { + equal.push(val); + } + } + return [...quickSort(left), ...equal, ...quickSort(right)]; +} + +const arrToSort = [5, 5, 3, 3, 2, 6, 1]; +console.log("\nsort result: ", quickSort(arrToSort), "\n"); \ No newline at end of file diff --git a/selection/selectionSort.js b/selection/selectionSort.js new file mode 100644 index 0000000..23e00e8 --- /dev/null +++ b/selection/selectionSort.js @@ -0,0 +1,24 @@ +const selectionSort = (arr) => { + let len = arr.length; + + for (let i = 0; i < len; i++) { + // Finding the smallest number in the sub-list + let min = i; + for (let j = i + 1; j < len; j++) { + if(arr[j] < arr[min]) { + min = j; + } + } + + if(min != i) { + // Swaping the elements + let tmp = arr[i]; + arr[i] = arr[min]; + arr[min] = tmp; + } + } + + return console.log("\nsort result: ", arr, "\n"); +} + +selectionSort([5, 3, 2, 1, 4]); \ No newline at end of file diff --git a/tests/heapsortTest.js b/tests/heapsortTest.js new file mode 100644 index 0000000..40ae3d7 --- /dev/null +++ b/tests/heapsortTest.js @@ -0,0 +1,13 @@ +import { heapSort } from "../heap/heapSort.js"; +import chai from "chai"; +const expect = chai.expect; + +describe('HeapSort Algorithm', () => { + it('should return a sorted array', () => { + expect(heapSort([3, 2, 5, 4, 0])).to.deep.equal([0, 2, 3, 4, 5]); //random array sortered in asc + expect(heapSort([-9, 1, 2, 11, 45, 56, 78])).to.deep.equal([-9, 1, 2, 11, 45, 56, 78]); //sortered array in asc is sorting in asc + expect(heapSort([-9, 1, 2, 11, 45, 56, 78], "desc")).to.deep.equal([78, 56, 45, 11, 2, 1, -9]); //sortered array in asc is sorting in desc + expect(heapSort([78, 56, 45, 11, 2, 1, -9])).to.deep.equal([-9, 1, 2, 11, 45, 56, 78]); //sortered array in desc is sorting in asc + expect(heapSort([78, 56, 45, 11, 2, 1, -9], "desc")).to.deep.equal([78, 56, 45, 11, 2, 1, -9]); //sortered array in desc is sorting in desc + }); +});