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1200 Minimum Absolute Difference.c
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1200 Minimum Absolute Difference.c
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void merge(int arr[], int low, int mid, int high)
{
int * ret_arr = (int *)malloc(sizeof(int) * (high - low + 1));
int ret_arr_index = 0;
int i=0,j=0;
for(i=low, j=mid+1; i<=mid && j<=high; )
{
if(arr[i] <= arr[j])
{
ret_arr[ret_arr_index++] = arr[i++];
}
else
{
ret_arr[ret_arr_index++] = arr[j++];
}
}
while(i<=mid)
{
ret_arr[ret_arr_index++] = arr[i++];
}
while(j<=high)
{
ret_arr[ret_arr_index++] = arr[j++];
}
memcpy(&arr[low], ret_arr, sizeof(int) * ret_arr_index);
free(ret_arr);
}
void merge_sort(int arr[], int low, int high)
{
if(low < high)
{
int mid = (low + high)/2;
merge_sort(arr, low, mid);
merge_sort(arr, mid+1, high);
merge(arr, low, mid, high);
}
}
/**
* Return an array of arrays of size *returnSize.
* The sizes of the arrays are returned as *returnColumnSizes array.
* Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().
*/
int** minimumAbsDifference(int* arr, int arrSize, int* returnSize, int** returnColumnSizes)
{
merge_sort(arr, 0, arrSize-1);
int i=0;
int min_diff = INT_MAX;
for(i=1; i<arrSize; i++)
{
int diff = arr[i] - arr[i-1];
if(diff < 0)
{
diff *= -1;
}
if(diff <= min_diff)
{
min_diff = diff;
}
}
int ** ret_arr = (int **)malloc(sizeof(int *) * arrSize);
int ret_arr_index = 0;
int * column_arr = (int *)malloc(sizeof(int) * arrSize);
int column_index = 0;
for(i=1; i<arrSize; i++)
{
int diff = arr[i] - arr[i-1];
if(diff < 0)
{
diff *= -1;
}
if(diff == min_diff)
{
int * new_arr = (int *)malloc(sizeof(int) * 2);
new_arr[0] = arr[i-1];
new_arr[1] = arr[i];
ret_arr[ret_arr_index++] = new_arr;
column_arr[column_index++] = 2;
}
}
*returnColumnSizes = column_arr;
*returnSize = ret_arr_index;
return ret_arr;
}