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ProblemWe are required to write a JavaScript function that takes in an array of coordinates, arr, as the first argument, and a number, num, as the second argument.Our function should find and return the num closest points to the origin (0, 0).(Here, the distance between two points on a plane is the Euclidean distance.)For example, if the input to the function is −const arr = [[3, 3], [5, -1], [-2, 4]]; const num = 2;Then the output should be −const output = [[3, 3], [-2, 4]];ExampleThe code for this will be − Live Democonst arr = [[3, 3], [5, -1], [-2, ... Read More
Univalued Binary Search TreeA binary search tree is univalued if every node in the tree has the same value.ProblemWe are required to write a JavaScript function that takes in the root of a BST and returns true if and only if the given tree is univalued, false otherwise.For example, if the nodes of the tree are −const input = [5, 5, 5, 3, 5, 6];Then the output should be −const output = false;ExampleThe code for this will be − Live Democlass Node{ constructor(data) { this.data = data; this.left = null; this.right ... Read More
ProblemWe are required to write a JavaScript function that takes in an array of integers, arr, as the first and the only argument.Suppose two indices, i and j in the array which satisfy the following conditions −i < j, andarr[i] { let max = 0 const stack = [0] for (let i = 1; i < arr.length; i++) { if (arr[i] < arr[stack[stack.length - 1]]) { stack.push(i) } } for (let i = arr.length - 1; i >= 0; i--) { ... Read More
ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.The array arr, will always be of even length.Our function should return true if and only if it is possible to reorder it such that arr[2 * i + 1] = 2 * arr[2 * i] for every 0 { const map = arr.reduce((acc, num) => { acc[num] = (acc[num] || 0) + 1 return acc }, {}); const keys = Object.keys(map) .map(key => Number(key)) .sort((a, ... Read More
ProblemJavaScript function that takes in two arrays, pushed and popped, as the first and the second argument. Both these arrays are guaranteed to consist of unique elements.Our function should return true if and only if this could have been the result of a sequence of push and pop operations on an initially empty stack, false otherwise.For example, if the input to the function is −const pushed = [1, 2, 3, 4, 5]; const popped = [4, 5, 3, 2, 1];Then the output should be −const output = true;Output ExplanationWe might do the following sequence −push(1), push(2), push(3), push(4), pop() -> ... Read More
ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.A move consists of choosing any arr[i], and incrementing it by 1. Our function is supposed to return the least number of moves to make every value in the array arr unique.For example, if the input to the function is −const arr = [12, 15, 7, 15];Then the output should be −const output = 1;Output ExplanationBecause if we increment any 15 to 16, the array will consist of all unique elements.ExampleThe code for this will be − Live Democonst ... Read More
ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.Our function should check whether the input array is a centrally peaked array or not. If it is a centrally peaked array, we should return true, false otherwise.The conditions for being a centrally peaked array are −arr.length >= 3There exists some i with 0 < i < arr.length - 1 such that:arr[0] < arr[1] < ... arr[i-1] < arr[i]arr[i] > arr[i+1] > ... > arr[arr.length - 1]For example, if the input to the function is −const arr = ... Read More
To show the origin, we can take the following Steps −Create the points x, y1 and y2 using numpy.Plot the sine and cosine curves using plot() methods.Plot the vertical line, i.e., x=0.Plot the horizontal line, i.e., y=0.Intersection point of (Step 3 and 4), could be the origin.To display the label of lines, use legend() method.To display the figure, use show() method.Exampleimport numpy as np from matplotlib import pyplot as plt plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True x = np.linspace(1, 10, 50) y1 = np.sin(x) y2 = np.cos(x) plt.plot(x, y1, c="orange", label="y=sin(x)") plt.plot(x, y2, c="green", label="y=cos(x)") plt.axvline(x=0, c="red", label="x=0") plt.axhline(y=0, c="yellow", ... Read More
To change the color of data points based on some variable in matplotlib, we can take the following steps −Create x, y and c variables using numpy.Plot the scatter points using x, y and for color, use c (Step 1).To display the image, use the show() method.Exampleimport numpy as np from matplotlib import pyplot as plt plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True x = np.linspace(1, 20, 50) y = np.log(x) c = np.random.randint(x) plt.scatter(x, y, c=c) plt.show()Output
To put a legend outside the plot with Pandas, we can take the following Steps −Make a dictionary d with keys Column1 and Column2.Make a data frame using DataFrame (d).Plot the data frame with a list of styles.Using legend(), place a legend on the figure. The bbox_to_anchor keyword gives a great degree of control for manual legend placement. For example, if you want your axes legend located at the figure's top right-hand corner instead of the axes' corner, simply specify the corner's location, and the coordinate system of that location.To display the figure, use the show() method.Exampleimport pandas as pd from ... Read More