| 4 | 4 | // |
| 5 | 5 | |
| 6 | 6 | /** |
| 7 | | * @param {string[]} input |
| 8 | | * @returns {string[]} |
| 7 | * Annotates a flower field by replacing empty spaces with the count of adjacent flowers. |
| 8 | * @param {string[]} input - A 2D array represented as a list of strings, where each string is a row. |
| 9 | * '*' represents a flower, ' ' represents an empty space. |
| 10 | * @returns {string[]} - The annotated flower field with counts replacing empty spaces. |
| 9 | 11 | */ |
| 10 | 12 | export const annotate = (input) => { |
| 11 | | throw new Error('Remove this statement and implement this function'); |
| 13 | // Edge Case: Handle empty input |
| 14 | if (!input || input.length === 0) { |
| 15 | return []; |
| 16 | } |
| 17 | |
| 18 | const rows = input.length; |
| 19 | |
| 20 | // Edge Case: Handle zero-width board |
| 21 | if (rows === 0 || input[0].length === 0) { |
| 22 | return input; |
| 23 | } |
| 24 | |
| 25 | // Create a 2D array for the result |
| 26 | const result = Array(rows); |
| 27 | |
| 28 | // Define the 8 possible directions (horizontal, vertical, diagonal) |
| 29 | const directions = [ |
| 30 | [-1, -1], [-1, 0], [-1, 1], |
| 31 | [0, -1], [0, 1], |
| 32 | [1, -1], [1, 0], [1, 1] |
| 33 | ]; |
| 34 | |
| 35 | // Process each cell in the grid |
| 36 | for (let i = 0; i < rows; i++) { |
| 37 | const rowLength = input[i].length; |
| 38 | result[i] = []; |
| 39 | for (let j = 0; j < rowLength; j++) { |
| 40 | // If the cell is a flower, keep it as is |
| 41 | if (input[i][j] === '*') { |
| 42 | result[i][j] = '*'; |
| 43 | } else { |
| 44 | // Count adjacent flowers |
| 45 | let count = 0; |
| 46 | |
| 47 | // Check all 8 directions |
| 48 | for (const [dx, dy] of directions) { |
| 49 | const ni = i + dx; |
| 50 | const nj = j + dy; |
| 51 | |
| 52 | // Edge Case: Check if the neighbor is within bounds |
| 53 | if (ni >= 0 && ni < rows && nj >= 0 && nj < (input[ni] ? input[ni].length : 0)) { |
| 54 | if (input[ni][nj] === '*') { |
| 55 | count++; |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | // Edge Case: If no adjacent flowers, leave the cell as space |
| 61 | // Otherwise, place the count |
| 62 | result[i][j] = count === 0 ? ' ' : count.toString(); |
| 63 | } |
| 64 | } |
| 65 | // Join the row array into a string |
| 66 | result[i] = result[i].join(''); |
| 67 | } |
| 68 | |
| 69 | return result; |
| 12 | 70 | }; |
| 71 | |
| 72 | // Handled Edge Cases: Empty input, rows with inconsistent lengths, zero-width board, neighbors out of bounds, no adjacent flowers |