Maintain a pointer A_end = m-1;
doing a comparision something similar to merge sort
int i=0;j=0;
while (i< m){
if (a[i] < b[j])
i++;
else{
swap(a[A_end],b[j])
A_end --;
j++;
}
}
This runs in O(m) time and no extra space, also the sort order is not
guarenteed.
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