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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. void merge(int* A, int n, int mid){
  5.   int *temp = (int*)malloc(sizeof(int)*n);
  6.   //set indexes for left and right side of array and 
  7.   //the beginning of the temporary array
  8.   int array_index = 0; //temporary array
  9.   int left = 0; //left side
  10.   int right = mid;
  11.  
  12.   while(left < mid && right < n){
  13.     if(A[left] <= A[right]){
  14.       temp[array_index] = A[left];
  15.       left++;
  16.       array_index++;
  17.     }else {
  18.       temp[array_index] = A[right];
  19.       right++;
  20.       array_index++;
  21.     }
  22.   }
  23.    while(left < mid){
  24.     temp[array_index] = A[left];
  25.     left++;
  26.     array_index++;
  27.   }
  28.   while(right< n){
  29.     temp[array_index] = A[right];
  30.     right++;
  31.     array_index++;
  32.   }
  33.  for(int i = 0; i<n; i++){
  34.     A[i] = temp[i];
  35.   }
  36.   free(temp);
  37. }
  38.  
  39. void merge_sort(int *A, int n){
  40.     if(n>=2){
  41.     int mid = n/2;
  42.     merge_sort(A,mid);
  43.     merge_sort(A+mid,n-mid);
  44.     merge(A, n, mid);
  45.   }
  46. }
  47.  
  48. int main(void) {
  49.   int arr[10] = {1,5,3,13,88,21,55,23,99,1};
  50.   merge_sort(arr, 10);
  51.   for(int i = 0; i<10; i++){
  52.     printf("%d ",arr[i]);
  53.   }
  54.   return 0;
  55. }
Success #stdin #stdout 0s 4180KB
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stdin
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Standard input is empty
stdout
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1 1 3 5 13 21 23 55 88 99
https://ideone.com/KziBEW
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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