# Minimum swaps 2

Contents

## Problem

You are given an unordered array consisting of consecutive integers [1, 2, 3, …, n] without any duplicates. You are allowed to swap any two elements. You need to find the minimum number of swaps required to sort the array in ascending order.

For example, given the array we perform the following steps:

``````i   arr                         swap (indices)
0   [7, 1, 3, 2, 4, 5, 6]   swap (0,3)
1   [2, 1, 3, 7, 4, 5, 6]   swap (0,1)
2   [1, 2, 3, 7, 4, 5, 6]   swap (3,4)
3   [1, 2, 3, 4, 7, 5, 6]   swap (4,5)
4   [1, 2, 3, 4, 5, 7, 6]   swap (5,6)
5   [1, 2, 3, 4, 5, 6, 7]
It took  swaps to sort the array.
``````

### Function Description

Complete the function minimumSwaps in the editor below. It must return an integer representing the minimum number of swaps to sort the array.

minimumSwaps has the following parameter(s):

arr: an unordered array of integers

Read more on the challenge page…

## My Solution

I’m providing the solution for Python and JS, please leave on the comments if you found a better way.

### Python

``````def minimumSwaps(arr):
swaps = 0
tmp = {}

for i, val in enumerate(arr):
tmp[val] = i

for i in range(len(arr)):
# because they are consecutives, I can see if the number is where it belongs
if arr[i] != i+1:
swaps += 1
t = arr[i]
arr[i] = i+1
arr[tmp[i+1]] = t

# Switch also the tmp array, no need to change i+1 as it's already good now
tmp[t] = tmp[i+1]

return swaps
``````

### Javascript

``````function minimumSwaps(arr) {
let swaps = 0;

const tmp = {};
arr.forEach((v, i) => tmp[v] = i);;

arr.forEach((v, i) => {
// because they are consecutives, I can see if the number is where it belongs
if (arr[i] !== i+1) {
swaps += 1
const t = arr[i]
arr[i] = i+1
arr[tmp[i+1]] = t

// Switch also the tmp array, no need to change i+1 as it's already good now
tmp[t] = tmp[i+1]
}
});

return swaps
}
``````

If you liked what you saw, please support my work!

Juan Cruz Martinez

Juan has made it his mission to help aspiring developers unlock their full potential. With over two decades of hands-on programming experience, he understands the challenges and rewards of learning to code. By providing accessible and engaging educational content, Juan has cultivated a community of learners who share their passion for coding. Leveraging his expertise and empathetic teaching approach, Juan has successfully guided countless students on their journey to becoming skilled developers, transforming lives through the power of technology.