In this post, we will solve the Left Rotation HackerRank Solution. This problem (Left Rotation) is a part of the HackerRank Problem Solving series.

the array that many steps left and return the result.

Example
d = 2

arr = [1, 2, 3, 4, 5]

After 2 rotations,arr = [1, 2, 3, 4, 5] .

Function Description

Complete the rotateLeft function in the editor below.

rotateLeft has the following parameters:

  • int d: the amount to rotate by
  • int arr[n]: the array to rotate

Returns

  • int[n]: the rotated array

Left Rotation Hacker Rank Solution

Problem solution in Python programming:

def rotateLeft(d, arr):
     result = [0] * len(arr)
     for i in range(len(arr)):
        result[i - d] = arr[i]
     return result

Problem solution in Java programming:

 public static List<Integer> rotateLeft(int d, List<Integer> arr) {
     int temp=0;
    for(int i=0;i<d;i++){
        System.out.println(i);
        temp = arr.get(0);
        arr.remove(0);
        arr.add(temp);
        
    }
    
    return arr;

    }

Problem solution in JavaScript programming:

function rotateLeft(d, arr) {
let newArr = [];
let len = arr.length
for(let i=0;i<len;i++){
    let num = arr[i];
    let diff = i-d;
    
    if(diff<0){
        newArr[len-d+i] = num;
    }else{
        newArr[i-d] = num
    }
    
}

return newArr
}

Categorized in:

HackerRank Solutions