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Swap Alternate CodeSend FeedbackYou have been given an array/list(ARR) of size N. You need to swap every pair of alternate elements in the array/list.You don't need to print or return anything, just change in the input array itself.Input Format :The first line contains an Integer 't' which denotes the number of test cases or queries to be run. Then the test cases follow.First line of each test case or query contains an integer 'N' representing the size of the array/list.Second line contains 'N' single space separated integers representing the elements in the array/list.Output Format :For each test case, print the elements of the resulting array in a single row separated by a single space.Output for every test case will be printed in a separate line.Constraints :1 <= t <= 10^20 <= N <= 10^5Time Limit: 1secSample Input 1:169 3 6 12 4 32Sample Output 1 :3 9 12 6 32 4Sample Input 2:299 3 6 12 4 32 5 11 1941 2 3 4Sample Output 2 :3 9 12 6 32 4 11 5 19 2 1 4 3

Question

Swap Alternate CodeSend FeedbackYou have been given an array/list(ARR) of size N. You need to swap every pair of alternate elements in the array/list.You don't need to print or return anything, just change in the input array itself.Input Format :The first line contains an Integer 't' which denotes the number of test cases or queries to be run. Then the test cases follow.First line of each test case or query contains an integer 'N' representing the size of the array/list.Second line contains 'N' single space separated integers representing the elements in the array/list.Output Format :For each test case, print the elements of the resulting array in a single row separated by a single space.Output for every test case will be printed in a separate line.Constraints :1 <= t <= 10^20 <= N <= 10^5Time Limit: 1secSample Input 1:169 3 6 12 4 32Sample Output 1 :3 9 12 6 32 4Sample Input 2:299 3 6 12 4 32 5 11 1941 2 3 4Sample Output 2 :3 9 12 6 32 4 11 5 19 2 1 4 3

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Solution

The problem statement is asking to write a program that will swap every pair of alternate elements in an array.

Here is a step-by-step solution in Python:

  1. First, define a function that takes an array as an argument.
def swapAlternate(arr):
  1. Inside the function, iterate over the array with a step of 2. This can be done using a for loop and the range function.
for i in range(0, len(arr)-1, 2):
  1. Inside the loop, swap the elements at index i and i+1. This can be done by using a temporary variable.
temp = arr[i]
arr[i] = arr[i+1]
arr[i+1] = temp
  1. The function doesn't need to return anything as the array is being modified in-place.

The complete code is:

def swapAlternate(arr):
    for i in range(0, len(arr)-1, 2):
        temp = arr[i]
        arr[i] = arr[i+1]
        arr[i+1] = temp

This function will swap every pair of alternate elements in the array. For example, if the input array is [9, 3, 6, 12, 4, 32], the output will be [3, 9, 12, 6, 32, 4].

This problem has been solved

Similar Questions

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