Insertion Sort

Internal

• Data Structures and Algorithms
• Sorting Algorithms

Overview

Insertion sort receives an array of integers and sorts the values in-place. It works as follows: we start from the left side of the array, and for each key, we insert it in the correct position in the already sorted sub-array that grows from left to right. The insertion is performed by scanning the sub-array from right to left in a while loop and swapping the elements until we reach the correct position of the key being handled.

public static void insertionSort(int[] a) {

  // handle trivial cases when the array is empty or has just one element

  // going forward, we assume the array has at least two elements

  for(int i = 1; i < a.length; i ++) {
  }
}