chore: format using prettier

This commit is contained in:
Lars Mueller
2023-10-28 00:56:39 +02:00
committed by Rak Laptudirm
parent 0b9fad86ba
commit 28c27d9474
2 changed files with 22 additions and 22 deletions

View File

@ -6,44 +6,44 @@
* @see https://en.wikipedia.org/wiki/Graph_coloring * @see https://en.wikipedia.org/wiki/Graph_coloring
*/ */
function mColoring(graph, m) { function mColoring(graph, m) {
const colors = new Array(graph.length).fill(0); const colors = new Array(graph.length).fill(0)
// Check if it's safe to color a vertex with a given color. // Check if it's safe to color a vertex with a given color.
function isSafe(vertex, color) { function isSafe(vertex, color) {
for (let i = 0; i < graph.length; i++) { for (let i = 0; i < graph.length; i++) {
if (graph[vertex][i] && colors[i] === color) { if (graph[vertex][i] && colors[i] === color) {
return false; return false
} }
} }
return true; return true
} }
// Use backtracking to try and color the graph. // Use backtracking to try and color the graph.
function solveColoring(vertex = 0) { function solveColoring(vertex = 0) {
if (vertex === graph.length) { if (vertex === graph.length) {
return true; return true
} }
for (let color = 1; color <= m; color++) { for (let color = 1; color <= m; color++) {
if (isSafe(vertex, color)) { if (isSafe(vertex, color)) {
colors[vertex] = color; colors[vertex] = color
if (solveColoring(vertex + 1)) { if (solveColoring(vertex + 1)) {
return true; return true
} }
// If no solution, backtrack. // If no solution, backtrack.
colors[vertex] = 0; colors[vertex] = 0
} }
} }
return false; return false
} }
// If coloring is possible, return the colors. // If coloring is possible, return the colors.
if (solveColoring()) { if (solveColoring()) {
return colors; return colors
} }
return null; return null
} }
export { mColoring }; export { mColoring }

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@ -1,4 +1,4 @@
import { mColoring } from '../MColoringProblem'; import { mColoring } from '../MColoringProblem'
describe('MColoringProblem', () => { describe('MColoringProblem', () => {
it('should color a triangle with 3 colors', () => { it('should color a triangle with 3 colors', () => {
@ -6,18 +6,18 @@ describe('MColoringProblem', () => {
[0, 1, 1], [0, 1, 1],
[1, 0, 1], [1, 0, 1],
[1, 1, 0] [1, 1, 0]
]; ]
const solution = mColoring(graph, 3); const solution = mColoring(graph, 3)
expect(solution).not.toBeNull(); expect(solution).not.toBeNull()
}); })
it('should not color a triangle with 2 colors', () => { it('should not color a triangle with 2 colors', () => {
const graph = [ const graph = [
[0, 1, 1], [0, 1, 1],
[1, 0, 1], [1, 0, 1],
[1, 1, 0] [1, 1, 0]
]; ]
const solution = mColoring(graph, 2); const solution = mColoring(graph, 2)
expect(solution).toBeNull(); expect(solution).toBeNull()
}); })
}); })