Programming & Computer Science Answers

Magical Indices

Given an array of integers and a number

• x. An index is valid ifitem y at an index is increased by x and
• x+y would be greater than the sum of all other items in the array.

Write a JS program to determine the number of valid indices.

Input

• The first line of input contains an array
• The second line of input contains a number

Output

• The output should be a number indicating the number of valid positions

Explanation

For example, an array A = [10, 20, 30] and a value x = 25.

We have values 10, 20, 30 at indices 0,1,2 respectively.

• Here index 0 is invalid because
• 10 + 25 = 35 is less than 20 + 30 = 50
• Here index 1 is valid because
• 20 + 25 = 45 is greater than 10 + 30 = 40
• Here index 2 is valid because
• 30 + 25 = 55 is greater than 10 + 20 = 30

So there are 2 valid indices.

Sample Input 1

[1, 2, 3, 5, 7]

13

Sample Output 1

3

Sample Input 2

[34, 32, 37, 38, 40]

10

Sample Output 2

Product of Array Items

Given an array

integers, write a JS program to get the product of the integers in the given array.Input

• The input will be a single line containing an array integers

Output

• The output should be a single line string containing the product as shown in sample outputs

Sample Input 1

[1, 2, 3]

Sample Output 1

1 * 2 * 3 = 6

Sample Input 2

[-1, -2, -3]

Sample Output 2

-1 * -2 * -3 = -6

Replacing Array Item

Given an array

myArray, targetItem, and a replaceItem, write a JS program to replace the targetItem with the given replaceItem in myArray. If myArray consists of more than one targetItem replace the first occurrence.Input

• The first line of input contains an array myArray
• The second line of input contains a targetItem
• The third line of input contains a replaceItem

Output

• The output should be an array containing the replaced item.

Sample Input 1

[1, 2, 3, "four", 5, 6]

"four"

4

Sample Output 1

[ 1, 2, 3, 4, 5, 6 ]

Sample Input 2

[22, 44, 88, 352, 352]

352

176

Sample Output 2

[ 22, 44, 88, 176, 352 ]

Squares of Array Items

Given an array

myArray, write a JS program to get the squares of each item in the given myArray.Input

• The input will be a single line containing an array myArray
• myArray consists of numbers and arrays

Output

• The output should be an array containing the square of each item

Sample Input 1

[[1, 2], [3, 4], [5, 6]]

Sample Output 1

[ [ 1, 4 ], [ 9, 16 ], [ 25, 36 ] ]

Sample Input 2

[12, [24], 36, [48, 60]]

Sample Output 2

[ 144, [ 576 ], 1296, [ 2304, 3600 ] ]

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