List ascending and descending

Ascending

sort

list.sort Sort the array in ascending order

num.Sort();
            for (int i = 0; i < k; i++)
            {
    
                result.Add(num[i]);
            }

Descending

sort

list.sort The array is sorted in ascending order
Flip traversal

num.Sort();
            for (int i = k; i > 0; i--)
            {
    
                result.Add(num[i]);
            }

The above is the use of sort Conduct , The trouble of the following method is to sort The method is disassembled into specific code

Bubble sort

  for (int i = 0; i < arr.Length; i++)
            {
    
                for (int j = i; j < arr.Length; j++)
                {
    
                    if (arr[i] > arr[j])
                    {
    
                        int temp = arr[i];
                        arr[i] = arr[j];
                        arr[j] = temp;
                    }
                }
            }

Sort from small to large