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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { assertEquals } from "../testing/asserts.ts";import { ascend, BinaryHeap, descend } from "./binary_heap.ts";import { Container, MyMath } from "./_test_utils.ts";
Deno.test("[collections/BinaryHeap] with default descend comparator", () => {  const maxHeap = new BinaryHeap<number>();  const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9];  const expected: number[] = [100, 10, 9, 9, 9, 1, 0, -1, -9, -10, -100];  let actual: number[] = [];
  assertEquals(maxHeap.length, 0);  assertEquals(maxHeap.isEmpty(), true);  assertEquals(maxHeap.peek(), undefined);  for (let i = 0; i < values.length; i++) {    assertEquals(maxHeap.push(values[i]), i + 1);  }  assertEquals(maxHeap.length, values.length);  assertEquals(maxHeap.isEmpty(), false);  while (!maxHeap.isEmpty()) {    assertEquals(maxHeap.peek(), expected[actual.length]);    actual.push(maxHeap.pop() as number);    assertEquals(maxHeap.length, expected.length - actual.length);    assertEquals(maxHeap.isEmpty(), actual.length === expected.length);  }  assertEquals(maxHeap.peek(), undefined);  assertEquals(actual, expected);
  actual = [];  assertEquals(maxHeap.push(...values), values.length);  assertEquals(maxHeap.length, values.length);  assertEquals(maxHeap.isEmpty(), false);  assertEquals(maxHeap.peek(), expected[0]);  for (const value of maxHeap) {    actual.push(value);    assertEquals(maxHeap.length, expected.length - actual.length);    assertEquals(maxHeap.isEmpty(), actual.length === expected.length);    assertEquals(maxHeap.peek(), expected[actual.length]);  }  assertEquals(actual, expected);});
Deno.test("[collections/BinaryHeap] with ascend comparator", () => {  const minHeap = new BinaryHeap<number>(ascend);  const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9];  const expected: number[] = [-100, -10, -9, -1, 0, 1, 9, 9, 9, 10, 100];  let actual: number[] = [];
  assertEquals(minHeap.length, 0);  assertEquals(minHeap.isEmpty(), true);  assertEquals(minHeap.peek(), undefined);  for (let i = 0; i < values.length; i++) {    assertEquals(minHeap.push(values[i]), i + 1);  }  assertEquals(minHeap.length, values.length);  assertEquals(minHeap.isEmpty(), false);  while (!minHeap.isEmpty()) {    assertEquals(minHeap.peek(), expected[actual.length]);    actual.push(minHeap.pop() as number);    assertEquals(minHeap.length, expected.length - actual.length);    assertEquals(minHeap.isEmpty(), actual.length === expected.length);  }  assertEquals(minHeap.peek(), undefined);  assertEquals(actual, expected);
  actual = [];  assertEquals(minHeap.push(...values), values.length);  assertEquals(minHeap.length, values.length);  assertEquals(minHeap.isEmpty(), false);  assertEquals(minHeap.peek(), expected[0]);  for (const value of minHeap) {    actual.push(value);    assertEquals(minHeap.length, expected.length - actual.length);    assertEquals(minHeap.isEmpty(), actual.length === expected.length);    assertEquals(minHeap.peek(), expected[actual.length]);  }  assertEquals(actual, expected);});
Deno.test("[collections/BinaryHeap] containing objects", () => {  const heap = new BinaryHeap((    a: Container,    b: Container,  ) => ascend(a.id, b.id));  const ids: number[] = [-10, 9, -1, 100, 1, 0, -100, 10, -9];
  for (let i = 0; i < ids.length; i++) {    const newContainer: Container = { id: ids[i], values: [] };    assertEquals(heap.push(newContainer), i + 1);    newContainer.values.push(i - 1, i, i + 1);    assertEquals(heap.length, i + 1);    assertEquals(heap.isEmpty(), false);  }
  const expected: number[] = [-100, -10, -9, -1, 0, 1, 9, 10, 100];  const expectedValue: number[] = [6, 0, 8, 2, 5, 4, 1, 7, 3];  for (let i = 0; i < ids.length; i++) {    assertEquals(heap.length, ids.length - i);    assertEquals(heap.isEmpty(), false);
    const expectedContainer = {      id: expected[i],      values: [expectedValue[i] - 1, expectedValue[i], expectedValue[i] + 1],    };    assertEquals(heap.peek(), expectedContainer);    assertEquals(heap.pop(), expectedContainer);  }  assertEquals(heap.length, 0);  assertEquals(heap.isEmpty(), true);});
Deno.test("[collections/BinaryHeap] from Iterable", () => {  const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9];  const originalValues: number[] = Array.from(values);  const expected: number[] = [100, 10, 9, 9, 9, 1, 0, -1, -9, -10, -100];  let heap = BinaryHeap.from(values);  assertEquals(values, originalValues);  assertEquals([...heap], expected);
  heap = BinaryHeap.from(values, { compare: ascend });  assertEquals(values, originalValues);  assertEquals([...heap].reverse(), expected);
  heap = BinaryHeap.from(values, {    map: (v: number) => 2 * v,  });  assertEquals([...heap], expected.map((v: number) => 2 * v));
  const math = new MyMath();  heap = BinaryHeap.from(values, {    map: function (this: MyMath, v: number) {      return this.multiply(3, v);    },    thisArg: math,  });  assertEquals(values, originalValues);  assertEquals([...heap], expected.map((v: number) => 3 * v));
  heap = BinaryHeap.from(values, {    compare: ascend,    map: (v: number) => 2 * v,  });  assertEquals(values, originalValues);  assertEquals([...heap].reverse(), expected.map((v: number) => 2 * v));
  heap = BinaryHeap.from(values, {    compare: ascend,    map: function (this: MyMath, v: number) {      return this.multiply(3, v);    },    thisArg: math,  });  assertEquals(values, originalValues);  assertEquals([...heap].reverse(), expected.map((v: number) => 3 * v));});
Deno.test("[collections/BinaryHeap] from BinaryHeap with default descend comparator", () => {  const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9];  const expected: number[] = [100, 10, 9, 9, 9, 1, 0, -1, -9, -10, -100];  const maxHeap = new BinaryHeap<number>();  maxHeap.push(...values);  let heap = BinaryHeap.from(maxHeap);  assertEquals([...maxHeap], expected);  assertEquals([...heap], expected);
  maxHeap.push(...values);  heap = BinaryHeap.from(maxHeap, { compare: ascend });  assertEquals([...maxHeap], expected);  assertEquals([...heap].reverse(), expected);
  maxHeap.push(...values);  heap = BinaryHeap.from(maxHeap, {    map: (v: number) => 2 * v,  });  assertEquals([...maxHeap], expected);  assertEquals([...heap], expected.map((v: number) => 2 * v));
  const math = new MyMath();  maxHeap.push(...values);  heap = BinaryHeap.from(maxHeap, {    map: function (this: MyMath, v: number) {      return this.multiply(3, v);    },    thisArg: math,  });  assertEquals([...maxHeap], expected);  assertEquals([...heap], expected.map((v: number) => 3 * v));
  maxHeap.push(...values);  heap = BinaryHeap.from(maxHeap, {    compare: ascend,    map: (v: number) => 2 * v,  });  assertEquals([...maxHeap], expected);  assertEquals([...heap].reverse(), expected.map((v: number) => 2 * v));
  maxHeap.push(...values);  heap = BinaryHeap.from(maxHeap, {    compare: ascend,    map: function (this: MyMath, v: number) {      return this.multiply(3, v);    },    thisArg: math,  });  assertEquals([...maxHeap], expected);  assertEquals([...heap].reverse(), expected.map((v: number) => 3 * v));});
Deno.test("[collections/BinaryHeap] from BinaryHeap with ascend comparator", () => {  const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9];  const expected: number[] = [-100, -10, -9, -1, 0, 1, 9, 9, 9, 10, 100];  const minHeap = new BinaryHeap<number>(ascend);  minHeap.push(...values);  let heap = BinaryHeap.from(minHeap);  assertEquals([...minHeap], expected);  assertEquals([...heap], expected);
  minHeap.push(...values);  heap = BinaryHeap.from(minHeap, { compare: descend });  assertEquals([...minHeap], expected);  assertEquals([...heap].reverse(), expected);
  minHeap.push(...values);  heap = BinaryHeap.from(minHeap, {    map: (v: number) => 2 * v,  });  assertEquals([...minHeap], expected);  assertEquals([...heap], expected.map((v: number) => 2 * v));
  const math = new MyMath();  minHeap.push(...values);  heap = BinaryHeap.from(minHeap, {    map: function (this: MyMath, v: number) {      return this.multiply(3, v);    },    thisArg: math,  });  assertEquals([...minHeap], expected);  assertEquals([...heap], expected.map((v: number) => 3 * v));
  minHeap.push(...values);  heap = BinaryHeap.from(minHeap, {    compare: descend,    map: (v: number) => 2 * v,  });  assertEquals([...minHeap], expected);  assertEquals([...heap].reverse(), expected.map((v: number) => 2 * v));
  minHeap.push(...values);  heap = BinaryHeap.from(minHeap, {    compare: descend,    map: function (this: MyMath, v: number) {      return this.multiply(3, v);    },    thisArg: math,  });  assertEquals([...minHeap], expected);  assertEquals([...heap].reverse(), expected.map((v: number) => 3 * v));});
Deno.test("[collections/BinaryHeap] edge case 1", () => {  const minHeap = new BinaryHeap<number>(ascend);  minHeap.push(4, 2, 8, 1, 10, 7, 3, 6, 5);  assertEquals(minHeap.pop(), 1);  minHeap.push(9);
  const expected = [2, 3, 4, 5, 6, 7, 8, 9, 10];  assertEquals([...minHeap], expected);});
Deno.test("[collections/BinaryHeap] edge case 2", () => {  interface Point {    x: number;    y: number;  }  const minHeap = new BinaryHeap<Point>((a, b) => ascend(a.x, b.x));  minHeap.push({ x: 0, y: 1 }, { x: 0, y: 2 }, { x: 0, y: 3 });
  const expected = [{ x: 0, y: 1 }, { x: 0, y: 3 }, { x: 0, y: 2 }];  assertEquals([...minHeap], expected);});
Deno.test("[collections/BinaryHeap] edge case 3", () => {  interface Point {    x: number;    y: number;  }  const minHeap = new BinaryHeap<Point>((a, b) => ascend(a.x, b.x));  minHeap.push(    { x: 0, y: 1 },    { x: 1, y: 2 },    { x: 1, y: 3 },    { x: 2, y: 4 },    { x: 2, y: 5 },    { x: 2, y: 6 },    { x: 2, y: 7 },  );
  const expected = [    { x: 0, y: 1 },    { x: 1, y: 2 },    { x: 1, y: 3 },    { x: 2, y: 5 },    { x: 2, y: 4 },    { x: 2, y: 6 },    { x: 2, y: 7 },  ];  assertEquals([...minHeap], expected);});
Deno.test("[collections/BinaryHeap] README example", () => {  const maxHeap = new BinaryHeap<number>();  maxHeap.push(4, 1, 3, 5, 2);  assertEquals(maxHeap.peek(), 5);  assertEquals(maxHeap.pop(), 5);  assertEquals([...maxHeap], [4, 3, 2, 1]);  assertEquals([...maxHeap], []);
  const minHeap = new BinaryHeap<number>(ascend);  minHeap.push(4, 1, 3, 5, 2);  assertEquals(minHeap.peek(), 1);  assertEquals(minHeap.pop(), 1);  assertEquals([...minHeap], [2, 3, 4, 5]);  assertEquals([...minHeap], []);
  const words = new BinaryHeap<string>((a, b) => descend(a.length, b.length));  words.push("truck", "car", "helicopter", "tank");  assertEquals(words.peek(), "helicopter");  assertEquals(words.pop(), "helicopter");  assertEquals([...words], ["truck", "tank", "car"]);  assertEquals([...words], []);});