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bogektbogekt
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getNthFib and riverSizes
1 parent f5a5233 commit b85eb2c

7 files changed

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lines changed

‎getNthFib.js

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// 0, 1, 2, 3, 4, 5, 6, 7, 8
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// 0, 0, 1, 1, 2, 3, 5, 8, 13
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function getNthFib(n) {
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if (!n || n === 1) return 0
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if (n <= 3) return 1
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return getNthFib(n - 1) + getNthFib(n - 2)
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}
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// Do not edit the line below.
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exports.getNthFib = getNthFib;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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expect(getNthFib(0) /*?*/, 0) //?.s $
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expect(getNthFib(1) /*?*/, 0) //?.s $
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expect(getNthFib(2) /*?*/, 1) //?.s $
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expect(getNthFib(3) /*?*/, 1) //?.s $
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expect(getNthFib(4) /*?*/, 2) //?.s $
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expect(getNthFib(5) /*?*/, 3) //?.s $
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expect(getNthFib(6) /*?*/, 5) //?.s $
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expect(getNthFib(7) /*?*/, 8) //?.s $
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expect(getNthFib(8) /*?*/, 13) //?.s $
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}

‎getNthFib2.js

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// 0, 1, 2, 3, 4, 5, 6, 7, 8
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// 0, 0, 1, 1, 2, 3, 5, 8, 13
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function getNthFib(n, memoize = {0: 0, 1: 0, 2: 1}) {
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if (!(n in memoize))
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memoize[n] = getNthFib(n - 1, memoize) + getNthFib(n - 2, memoize)
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return memoize[n]
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}
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// Do not edit the line below.
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exports.getNthFib = getNthFib;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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expect(getNthFib(0) /*?*/, 0) //?.s $
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expect(getNthFib(1) /*?*/, 0) //?.s $
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expect(getNthFib(2) /*?*/, 1) //?.s $
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expect(getNthFib(3) /*?*/, 1) //?.s $
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expect(getNthFib(4) /*?*/, 2) //?.s $
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expect(getNthFib(5) /*?*/, 3) //?.s $
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expect(getNthFib(6) /*?*/, 5) //?.s $
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expect(getNthFib(7) /*?*/, 8) //?.s $
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expect(getNthFib(8) /*?*/, 13) //?.s $
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}

‎getNthFib3.js

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// 0, 1, 2, 3, 4, 5, 6, 7, 8
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// 0, 0, 1, 1, 2, 3, 5, 8, 13
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function getNthFib(n) {
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if (!n || n === 1) return 0
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if (n <= 3) return 1
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let prev = 1
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let fib = 2
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while (--n > 3)
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[prev, fib] = [fib, fib + prev]
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return fib
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}
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// Do not edit the line below.
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exports.getNthFib = getNthFib;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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expect(getNthFib(0) /*?*/, 0) //?.s $
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expect(getNthFib(1) /*?*/, 0) //?.s $
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expect(getNthFib(2) /*?*/, 1) //?.s $
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expect(getNthFib(3) /*?*/, 1) //?.s $
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expect(getNthFib(4) /*?*/, 2) //?.s $
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expect(getNthFib(5) /*?*/, 3) //?.s $
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expect(getNthFib(6) /*?*/, 5) //?.s $
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expect(getNthFib(7) /*?*/, 8) //?.s $
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expect(getNthFib(8) /*?*/, 13) //?.s $
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}

‎getNthFib4.js

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// 0, 1, 2, 3, 4, 5, 6, 7, 8
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// 0, 0, 1, 1, 2, 3, 5, 8, 13
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function getNthFib(n) {
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if (!n || n === 1) return 0
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if (n <= 3) return 1
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const lastTwo = [1, 2]
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while (--n > 3)
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[lastTwo[0], lastTwo[1]] = [lastTwo[1], lastTwo[0] + lastTwo[1]]
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return lastTwo[1]
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}
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// Do not edit the line below.
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exports.getNthFib = getNthFib;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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expect(getNthFib(0) /*?*/, 0) //?.s $
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expect(getNthFib(1) /*?*/, 0) //?.s $
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expect(getNthFib(2) /*?*/, 1) //?.s $
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expect(getNthFib(3) /*?*/, 1) //?.s $
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expect(getNthFib(4) /*?*/, 2) //?.s $
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expect(getNthFib(5) /*?*/, 3) //?.s $
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expect(getNthFib(6) /*?*/, 5) //?.s $
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expect(getNthFib(7) /*?*/, 8) //?.s $
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expect(getNthFib(8) /*?*/, 13) //?.s $
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}

‎getNthFib5.js

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// 0, 1, 2, 3, 4, 5, 6, 7, 8
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// 0, 0, 1, 1, 2, 3, 5, 8, 13
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function getNthFib(n) {
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const lastTwo = [0, 1]
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while (--n > 0)
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[lastTwo[0], lastTwo[1]] = [lastTwo[1], lastTwo[0] + lastTwo[1]]
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return n > 1 ? lastTwo[1] : lastTwo[0]
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}
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// Do not edit the line below.
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exports.getNthFib = getNthFib;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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expect(getNthFib(0) /*?*/, 0) //?.s $
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expect(getNthFib(1) /*?*/, 0) //?.s $
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expect(getNthFib(2) /*?*/, 1) //?.s $
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expect(getNthFib(3) /*?*/, 1) //?.s $
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expect(getNthFib(4) /*?*/, 2) //?.s $
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expect(getNthFib(5) /*?*/, 3) //?.s $
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expect(getNthFib(6) /*?*/, 5) //?.s $
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expect(getNthFib(7) /*?*/, 8) //?.s $
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expect(getNthFib(8) /*?*/, 13) //?.s $
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}

‎riverSizes.js

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function riverSizes(matrix) {
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const riversSizes = [];
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const notVisited = new Array(matrix.length).fill(null)
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.map((x, i) => new Array(matrix[i].length).fill(1))
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const context = {
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m: matrix.length,
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n: matrix[0].length,
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visit: (i, j) => notVisited[i][j] = 0,
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validRiver: ([i, j]) => notVisited[i][j] && matrix[i][j],
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}
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for (let i = 0; i < matrix.length; i++)
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for (let j = 0; j < matrix[i].length; j++) {
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if (matrix[i][j] === 0 || !notVisited[i][j]) continue
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riversSizes.push(traverse(context, [i, j], 1))
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}
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return riversSizes
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}
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function traverse(context, [i, j], length) {
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context.visit(i, j)
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const { m, n, validRiver } = context
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if (j - 1 >= 0 && validRiver([i, j - 1])) length = traverse(context, [i, j - 1], length + 1)
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if (j + 1 < n && validRiver([i, j + 1])) length = traverse(context, [i, j + 1], length + 1)
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if (i - 1 >= 0 && validRiver([i - 1, j])) length = traverse(context, [i - 1, j], length + 1)
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if (i + 1 < m && validRiver([i + 1, j])) length = traverse(context, [i + 1, j], length + 1)
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return length
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}
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// Do not edit the line below.
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exports.riverSizes = riverSizes;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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console.clear()
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expect(riverSizes([
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[0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1],
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[1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1],
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]) /*?*/, [4, 18]) //?.s $
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expect(riverSizes([
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[0, 1, 0, 1, 1],
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[1, 1, 1, 0, 0],
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[1, 1, 0, 0, 1],
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[1, 0, 1, 1, 1],
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[1, 1, 1, 0, 0],
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]) /*?*/, [14,2]) //?.s $
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expect(riverSizes([
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[1, 0, 0, 0, 0, 0, 1],
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[0, 1, 0, 0, 0, 1, 0],
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[0, 0, 1, 0, 1, 0, 0],
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[0, 0, 1, 1, 1, 0, 0],
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[0, 0, 1, 0, 1, 0, 0],
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[0, 1, 0, 0, 0, 1, 0],
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[1, 0, 0, 0, 0, 0, 1]
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]) /*?*/, [1, 1, 1, 1, 7, 1, 1, 1, 1]) //?.s $
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}

‎riverSizes2.js

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function riverSizes(matrix) {
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const riversSizes = [];
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const m = matrix.length
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const n = matrix[0].length
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const notVisited = new Array(m*n).fill(1)
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const context = {
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m,
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n,
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visit: (i, j) => notVisited[i*n + j] = 0,
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isNotVisited: (i, j) => notVisited[i*n + j],
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isValidRiver: ([i, j]) => context.isNotVisited(i, j) && matrix[i][j],
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}
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for (let i = 0; i < matrix.length; i++)
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for (let j = 0; j < matrix[i].length; j++)
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if (context.isValidRiver([i, j]))
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riversSizes.push(traverse(context, [i, j], 1))
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return riversSizes
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}
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function traverse(context, [i, j], length) {
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context.visit(i, j)
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const { m, n, isValidRiver } = context
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if (j - 1 >= 0 && isValidRiver([i, j - 1])) length = traverse(context, [i, j - 1], length + 1)
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if (j + 1 < n && isValidRiver([i, j + 1])) length = traverse(context, [i, j + 1], length + 1)
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if (i - 1 >= 0 && isValidRiver([i - 1, j])) length = traverse(context, [i - 1, j], length + 1)
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if (i + 1 < m && isValidRiver([i + 1, j])) length = traverse(context, [i + 1, j], length + 1)
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return length
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}
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// Do not edit the line below.
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exports.riverSizes = riverSizes;
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const test = true
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if (typeof test === 'boolean' && test) {
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const { expect } = require('../leet-code/utils.js');
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console.clear()
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expect(riverSizes([
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[0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1],
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[1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1],
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]) /*?*/, [4, 18]) //?.s $
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expect(riverSizes([
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[0, 1, 0, 1, 1],
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[1, 1, 1, 0, 0],
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[1, 1, 0, 0, 1],
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[1, 0, 1, 1, 1],
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[1, 1, 1, 0, 0],
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]) /*?*/, [14,2]) //?.s $
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expect(riverSizes([
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[1, 0, 0, 0, 0, 0, 1],
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[0, 1, 0, 0, 0, 1, 0],
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[0, 0, 1, 0, 1, 0, 0],
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[0, 0, 1, 1, 1, 0, 0],
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[0, 0, 1, 0, 1, 0, 0],
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[0, 1, 0, 0, 0, 1, 0],
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[1, 0, 0, 0, 0, 0, 1]
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]) /*?*/, [1, 1, 1, 1, 7, 1, 1, 1, 1]) //?.s $
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}

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