java insertion sort
/**
* Insertion sort algorithm, O(n^2) time complexity.
*/
public static void insertionSort(int[] arr) {
int n = arr.length;
for(int i = 1; i < n; i++) {
int key = arr[i];
int j = i - 1;
//shift until you find the position to place the element 'key'
while(j >= 0 && arr[j] > key) {
arr[j+1] = arr[j];
j--;
}
//place element 'key' in the correct position in the sorted part of the array
arr[j+1] = key;
}
}
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