Given an array which consists of only 0, 1 and 2 sort the array without using any sorting algorithm in C

December 13, 2023

Sort the array with elements 0, 1 and 2 in C

 

Here, in this page we will discuss the program to sort the array with elements 0, 1 and 2 in C . We use the concept of counting the frequency of 0, 1 and 2 . We are giving with the size of the array along with array elements .We have to print sorted array.

Example :  Input : n= 5
                                arr[5] = { 0, 1, 2, 0, 0}

                    Output : 0 0 0 1 2

Sort the array with elements 0, 1 and 2 in C

Algorithm :

  • Take the size of the array from the user and store it in variable say n.
  • Now, declare a vector of size n and take the n elements of the vector say arr from the user.
  • Declare three variables say count_0, count_1 and count_2 and initialize them with 0. (These variable will hold the count of the frequency of 0, 1 and 2).
  • Now, iterate over the array and increase the value of variable count_0 if arr[i] is 0 , count_1 if arr[i] is 1 and count_2 if arr[i] is 2 by value 1.
  • Now, clear the vector.
  • Declare variable say i and initialized it with 0.
  • Run a while loop till count_0 is not zero and inside while loop set arr[i++] =0.
  • Again Run a while loop till count_1 is not zero and inside while loop set arr[i++] =1.
  • At last again run while loop till count_2 is not zero and inside while loop set arr[i++] =2.
  • Finally the array get sorted without using any sorting technique and print the array.
Sort the elements 0, 1 and 2

 C Code

Run 
#include

int main(){

int n;
n=4;

int arr[n]={1,5,6,7};
int count_0=0, count_1 =0, count_2=0;

for(int i=0; i<n; i++){

if(arr[i]==0) count_0++;
else if(arr[i]==1) count_1++;
else count_2++;
}
int i=0;
while(count_0--) arr[i++]=0;
while(count_1--) arr[i++]=1;
while(count_2--) arr[i++]=2;
for(int i=0; i<n; i++)
printf("%d ", arr[i]);
return 0;
}						
Output :
1 2 2 2

Find the “Kth” max and min element of an array 

Move all the negative elements to one side of the array

Find the Union and Intersection of the two sorted arrays

Find Largest sum contiguous Subarray

Minimize the maximum difference between heights 

Prime Course Trailer

Related Banners

Get PrepInsta Prime & get Access to all 200+ courses offered by PrepInsta in One Subscription

Get Prime