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Stack

# Stack - Invariant Algorithm maintains a[lo ≤ key ≤...

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public class Stack<Item> { private Node first = null; private class Node { private Item item; private Node next;} public boolean isEmpty() { return first == null; } public void push(Item item) { Node second = first; first = new Node(); first.item = item; first.next = second;} public Item pop() { Item item = first.item; first = first.next; return item; } } public static void quicksort(double[] a, int left, int right) { if (right <= left) return; int i = partition(a, left, right); quicksort(a, left, i-1); quicksort(a, i+1, right); } Binary Search: Java Implementation
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Unformatted text preview: Invariant. Algorithm maintains a[lo] ≤ key ≤ a[hi-1]. Java library implementation: Arrays.binarySearch() public static int search(String key, String a) { return search(key, a, 0, a.length); } public static int search(String key, String a, int lo, int hi) { if (hi <= lo) return -1; int mid = lo + (hi - lo) / 2; int cmp = a[mid].compareTo(key); if (cmp > 0) return search(key, a, lo, mid); else if (cmp < 0) return search(key, a, mid+1, hi); else return mid; }...
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