🏋️‍♂️ added challenge 20: distribute the weight

readme.md

@@ -40,6 +40,7 @@ Para esta versión estaré usando TypeScript, en su versión 5.3.2.
 | 17  | [**Optimizando el alquiler**](https://adventjs.dev/es/challenges/2023/17)           |     🟢     | [TS](./src/challenges/17.ts) | [SPEC](./src/tests/17.spec.ts) |
 | 18  | [**El reloj digital**](https://adventjs.dev/es/challenges/2023/18)           |     🔴     | [TS](./src/challenges/18.ts) | [SPEC](./src/tests/18.spec.ts) |
 | 19  | [**Enfrenta el sabotage**](https://adventjs.dev/es/challenges/2023/19)           |     🟠     | [TS](./src/challenges/19.ts) | [SPEC](./src/tests/19.spec.ts) |
+| 20  | [**Distribuye el peso**](https://adventjs.dev/es/challenges/2023/20)           |     🔴     | [TS](./src/challenges/20.ts) | [SPEC](./src/tests/20.spec.ts) |
 
 ## Herramientas utilizadas 🛠️
 

src/challenges/20.ts

@@ -0,0 +1,21 @@
+export function distributeGifts (weights: Array<Array<number | null>>): number[][] {
+  const n = weights.length; const m = weights[0].length
+  const gifts: number[][] = Array(n).fill(null).map(() => Array(m).fill(0))
+  for (let i = 0; i < n; ++i) {
+    for (let j = 0; j < m; ++j) {
+      const up = weights[i - 1]?.[j]
+      const lf = weights[i][j - 1]
+      const rg = weights[i][j + 1]
+      const dw = weights[i + 1]?.[j]
+      const ct = weights[i][j]
+      let n = 0; let sum = 0
+      for (const x of [up, lf, rg, dw, ct]) {
+        const z = +(x != null)
+        sum += +([0, x][z] as number)
+        n += z
+      }
+      gifts[i][j] = Math.round(sum / n)
+    }
+  }
+  return gifts
+}

src/tests/20.spec.ts

@@ -0,0 +1,140 @@
+import { test, expectTypeOf, expect, describe } from 'vitest'
+import { distributeGifts } from '../challenges/20'
+
+describe('Challenge #20', () => {
+  test('Test #01', () => {
+    expectTypeOf(distributeGifts).returns.toEqualTypeOf([])
+  })
+
+  test('Test #02', () => {
+    const received = distributeGifts([
+      [4, 5, 1],
+      [6, null, 3],
+      [8, null, 4]
+    ])
+    const expected = [
+      [
+        5,
+        3,
+        3
+      ],
+      [
+        6,
+        5,
+        3
+      ],
+      [
+        7,
+        6,
+        4
+      ]
+    ]
+    expect(received).toEqual(expected)
+  })
+
+  test('Test #03', () => {
+    const received = distributeGifts([
+      [2, null],
+      [null, 3]
+    ])
+    const expected = [
+      [
+        2,
+        3
+      ],
+      [
+        3,
+        3
+      ]
+    ]
+    expect(received).toEqual(expected)
+  })
+
+  test('Test #04', () => {
+    const received = distributeGifts([
+      [2, 1, 1],
+      [3, 4, null]
+    ])
+    const expected = [
+      [
+        2,
+        2,
+        1
+      ],
+      [
+        3,
+        3,
+        3
+      ]
+    ]
+    expect(received).toEqual(expected)
+  })
+
+  test('Test #05', () => {
+    const received = distributeGifts([
+      [null, 5],
+      [3, null]
+    ])
+    const expected = [
+      [
+        4,
+        5
+      ],
+      [
+        3,
+        4
+      ]
+    ]
+    expect(received).toEqual(expected)
+  })
+
+  test('Test #06', () => {
+    const received = distributeGifts([
+      [1, 2, 3],
+      [4, 5, 6],
+      [7, 8, 9]
+    ])
+    const expected = [
+      [
+        2,
+        3,
+        4
+      ],
+      [
+        4,
+        5,
+        6
+      ],
+      [
+        6,
+        7,
+        8
+      ]
+    ]
+    expect(received).toEqual(expected)
+  })
+
+  test('Test #07', () => {
+    const received = distributeGifts([
+      [null, 1, null, 1, null],
+      [1, null, 1, null, 1]
+    ])
+    const expected = [
+      [
+        1,
+        1,
+        1,
+        1,
+        1
+      ],
+      [
+        1,
+        1,
+        1,
+        1,
+        1
+      ]
+    ]
+    expect(received).toEqual(expected)
+  })
+})