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Amazon Interview Question for Quality Assurance Engineers


Country: India
More Questions from This Interview



Comment hidden because of low score. Click to expand.
1
of 1 vote

def solve(arr):
	left=0
	right=len(arr)-1
	while left<right:
		while left<right and arr[left]==0:
			left+=1
		while left<right and arr[right]==1:
			right-=1
		arr[left],arr[right]=arr[right],arr[left]
		left+=1
		right-=1
	return arr

- Anonymous October 24, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
1
of 1 vote

O(n) where in is the length of bin_array
In python:

def sort(bin_array):
    length = len(bin_array)
    ones = sum(bin_array)
    zeros = length - ones
    return [0 for _ in range(zeros)] + [1 for _ in range(ones)]

- Anonymous November 02, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
1
of 1 vote

a simple bubble sort will work
for(int i=0; i<arr.length;i++) {
if(arr[i] == 0) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
j++;
}
}

- koushalm31 February 09, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Let me give you an O(2n) algorithm (pseudocode).

sum = 0;
binaryArray = [0, 1, 1, 0, 0, 1, 0, 0, 1];

for i in binaryArray:
    sum = sum + i;

length = len(binaryArray)
result = zeros(length)

for i, value in enumerate(result):
    if sum > 0:
        result[length - i] = 1
        sum = sum - 1

- Prasad N R October 21, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static int[] zerosToLeft(int[] arr) {
		int j = arr.length-1;
		int[] rez = new int[arr.length];
		for(int i = 0; i < arr.length; i++){
			if(arr[i] == 1) {
				rez[j] = arr[i];
				j--;
			}
		}
		return rez;

}

- Ahmet October 27, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

let a = [1,0,1,0,0,1,0,1,0,0,0,0,0]

func zeroFollowedByOne(a: [Int]) -> [Int] {
var a = a
var l = 0
var h = a.count - 1

while l < h {
if a[l] == 1 && a[h] == 0 {
let temp = a[h]
a[h] = a[l]
a[l] = temp
l+=1
h-=1
} else if a[l] == 0 && a[h] == 1 {
l+=1
h-=1
} else if a[l] == 0 && a[h] == 0 {
l+=1
}
}

return a
}

- trycoding October 30, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

let a = [1,0,1,0,0,1,0,1,0,0,0,0,0]

func zeroFollowedByOne(a: [Int]) -> [Int] {
    var a = a
    var l = 0
    var h = a.count - 1
    
    while l < h {
        if a[l] == 1 && a[h] == 0 {
            let temp = a[h]
            a[h] = a[l]
            a[l] = temp
            l+=1
            h-=1
        } else if a[l] == 0 && a[h] == 1 {
            l+=1
            h-=1
        } else if a[l] == 0 && a[h] == 0 {
            l+=1
        }
    }
    
    return a
}

- trycoding October 30, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

let a = [1,0,1,0,0,1,0,1,0,0,0,0,0]

func zeroFollowedByOne(a: [Int]) -> [Int] {
    var a = a
    var l = 0
    var h = a.count - 1
    
    while l < h {
        if a[l] == 1 && a[h] == 0 {
            let temp = a[h]
            a[h] = a[l]
            a[l] = temp
            l+=1
            h-=1
        } else if a[l] == 0 && a[h] == 1 {
            l+=1
            h-=1
        } else if a[l] == 0 && a[h] == 0 {
            l+=1
        }
    }
    
    return a

}

- trycoding October 30, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static void main(String[] args) {

int array[]= {0,1,1,0,0,1,0,0,1};
int lastIndexValue=array.length-1;
int newArray[]= new int[array.length];

for(int i=0;i<array.length;i++) {

if(array[i]==1) {
newArray[lastIndexValue]=1;
lastIndexValue--;
}
}

System.out.println(Arrays.toString(newArray));
}

- Amir Luitel November 10, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static void main(String[] args) {
		
		int array[]= {0,1,1,0,0,1,0,0,1};
		int lastIndexValue=array.length-1;
		int newArray[]= new int[array.length];
		
		for(int i=0;i<array.length;i++) {
			
			if(array[i]==1) {
				newArray[lastIndexValue]=1;
				lastIndexValue--;
			}
		}
		
		System.out.println(Arrays.toString(newArray));
	}

- Amir Luitel November 10, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

def sortbits(il):

    for i in range(len(il)):
        if il[i] == 1:
            for j in range(len(il) - 1, i + 1, -1):
                if il[j] == 0:
                    il[i], il[j] = il[j], il[i]
                    break

    return il

driver = [0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0]
print(sortbits(driver))

- Anonymous November 10, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

def sortbits(il):
    for i in range(len(il)):
        if il[i] == 1:
            for j in range(len(il) - 1, i + 1, -1):
                if il[j] == 0:
                    il[i], il[j] = il[j], il[i]
                    break
    return il

driver = [0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0]
print(sortbits(driver))

- Anonymous November 10, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int arr[]= {0,1,1,0,0,1,0,0,1};
    int j = 0;
    for(int i=0; i<arr.length;i++) {
      if(arr[i] == 0) {
        int temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
        j++;
      }
    }

- Sudip November 17, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int arr[]= {0,1,1,0,0,1,0,0,1};
    int j = 0;
    for(int i=0; i<arr.length;i++) {
      if(arr[i] == 0) {
        int temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
        j++;
      }
    }

- Sudip November 17, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int arr[]= {0,1,1,0,0,1,0,0,1};
    int j = 0;
    for(int i=0; i<arr.length;i++) {
      if(arr[i] == 0) {
        int temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
        j++;
      }

}

- Anonymous November 17, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int arr[]= {0,1,1,0,0,1,0,0,1};
int j = 0;
for(int i=0; i<arr.length;i++) {
if(arr[i] == 0) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
j++;
}
}

- Anonymous November 17, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int arr[]= {0,1,1,0,0,1,0,0,1};
int j = 0;
for(int i=0; i<arr.length;i++) {
if(arr[i] == 0) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
j++;
}
}

- sudip313 November 17, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int arr[]= {0,1,1,0,0,1,0,0,1};
    int j = 0;
    for(int i=0; i<arr.length;i++) {
      if(arr[i] == 0) {
        int temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
        j++;
      }
    }

- sudip313 November 17, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

quicksort finding pivot logic

- karun November 21, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static void main(String[] args)
	    {
	     int arr[] = { 1, 9, 8, 4, 0, 0, 2, 7, 0, 6, 0, 9
	     int n = arr.length; 
	     int count = 0;
	     for (int i = 0; i<=arr.length-1; i++)
	     {
	            if (arr[i] != 0) 
	            arr[count++] = arr[i];
	     }
	     while (count < n) 
	     {
	       arr[count++] = 0;
	     }
	     
	     System.out.println("Array after pushing zeros to the back: "); 
	     	for (int i = 0; i<=arr.length-1; i++)
	        {
	            System.out.print(arr[i]+" ");
	        }
	    }

- Anonymous November 21, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Simple sorting is fine.

- Anonymous December 03, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public class BinaryArray {
    public static void main(String[] args) {
        int[] arr = new int[]{0, 0, 0, 1, 1, 1, 0};
        sort(arr);
        for (int a : arr) System.out.println(a);
    }

    private static void sort(int[] arr) {
        int i = 0;
        int j = arr.length - 1;
        while (i <= j) {
            while (arr[i] != 1) i++;

            while (arr[j] != 0) j--;

            if (i <= j) {
                int temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
                i++;
                j--;
            }
        }
    }

- vishnuvv40 January 04, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static int[] SortBinaryArr(int[]  num)
        {
            int len = num.Length-1;
            int beg = 0;
            int[] result = new int[num.Count()];

            while(beg != len)
            {
                if(num[beg] > num[len])
                {
                    result[beg] = num[len];
                    result[len] = num[beg];
                }
                else
                {
                    result[beg] = num[beg];
                    result[len] = num[len];
                }
                beg++;
                len--;
            }
            return result;
        }

- Anonymous February 25, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

from array import array

array_x = array('b',[0, 1, 1, 0, 0, 1, 0, 0, 1])

k = list(array_x)
k.sort()

- Anonymous July 05, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

from array import array

array_x = array('b',[0, 1, 1, 0, 0, 1, 0, 0, 1])

k = list(array_x)
k.sort()

- Anonymous July 05, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int[] numbers = {0,1,1,0,0,1,0,0,1};


Arrays.sort(numbers);

for(Integer n : numbers)
{
System.out.print(n);

}

- sathya August 01, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

int[] numbers = {0,1,1,0,0,1,0,0,1};
		
		
		Arrays.sort(numbers);
		
		for(Integer n : numbers)
		{
			System.out.print(n);
			
		}

- sathya August 01, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

def sorybinarray(arr):
    count = 0
    for i in range(len(arr)):
        if arr[i] == 0:
            count = count + 1
    for i in range(0, count):
        arr[i] = 0
    for i in range(count, len(arr)):
        arr[i] = 1


arr = [0, 1, 1, 0, 0, 1, 0, 0, 1]
sorybinarray(arr)
for i in range(len(arr)):
    print(arr[i])

- manasa August 10, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static int[] swapZerosOnes(int[] arr) {

int []k = new int[arr.length];
int left = 0; int right = k.length-1;

for(int i= 0 ; i<= arr.length -1 ; i++) {
if(arr[i] == 0) {
k[left] = arr[i];
left++;
}else if(arr[i] == 1) {
k[right] = arr[i];
right--;
}
}

return k;


}

- Sindhu Srinivasan August 23, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static int[] swapZerosOnes(int[] arr) {

int []k = new int[arr.length];
int left = 0; int right = k.length-1;

for(int i= 0 ; i<= arr.length -1 ; i++) {
if(arr[i] == 0) {
k[left] = arr[i];
left++;
}else if(arr[i] == 1) {
k[right] = arr[i];
right--;
}
}
return k;
}

- Sindhu Srinivasan August 23, 2020 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

public static void main(String[] args) {

		int array[] = { 2,3,3,3,3,2,2, 2, 3,1,9 };
		
		int array_len = array.length;
		
		Arrays.sort(array);// [1, 1, 1, 1, 2, 2, 2, 2, 2]
		
		System.out.println(Arrays.toString(array));

		int newArr[] = new int[array_len];// new int[8]

		for (int i = 0; i < array.length; i++) {// 0-8//9 iterations

			newArr[i] = array[array_len-1];// newArr[0] = array[8]

			array_len--;
		}
		System.out.println(Arrays.toString(newArr));

}

- D V N Kiran February 06, 2021 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

#Python

array = [0, 1, 1, 0, 0, 1, 0, 0, 1]
new_array = []

def sort(array):
new_array.extend([0] * array.count(0))
new_array.extend([1] * array.count(1))
print(new_array)
return

- AJ June 12, 2021 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

#Python
array = [0, 1, 1, 0, 0, 1, 0, 0, 1]
new_array = []


def sort(array):
    new_array.extend([0] * array.count(0)) 
    new_array.extend([1] * array.count(1)) 
    print(new_array)
    return

- Anonymous June 12, 2021 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

private fun sortBArray(input: Array<Int>) {
    var index = 0
    var zeroIndex = input.size - 1
    
    while (index < zeroIndex) {
        val item = input[index]
        if (item == 1) {
            index++
            continue
        }

        val switchWith = input[zeroIndex]
        input[index] = switchWith
        input[zeroIndex] = item
        zeroIndex--
    }
}

- Anonymous March 30, 2022 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

fun sortBArray(input: Array<Int>) {
    var index = 0
    var zeroIndex = input.size - 1

    while (index < zeroIndex) {
        val item = input[index]
        if (item == 1) {
            index++
            continue
        }

        val switchWith = input[zeroIndex]
        input[index] = switchWith
        input[zeroIndex] = item
        zeroIndex--
    }

}

- Someone March 30, 2022 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

private fun sortBArray(input: Array<Int>) {
    var index = 0
    var zeroIndex = input.size - 1

    while (index < zeroIndex) {
        val item = input[index]
        if (item == 1) {
            index++
            continue
        }

        val switchWith = input[zeroIndex]
        input[index] = switchWith
        input[zeroIndex] = item
        zeroIndex--
    }
}

- Anonymous March 31, 2022 | Flag Reply


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