Package edu.princeton.cs.algs4

Class StaticSETofInts

Object

edu.princeton.cs.algs4.StaticSETofInts

public class StaticSETofInts
extends Object

The StaticSETofInts class represents a set of integers. It supports searching for a given integer is in the set. It accomplishes this by keeping the set of integers in a sorted array and using binary search to find the given integer.

The rank and contains operations take logarithmic time in the worst case.

For additional documentation, see Section 1.2 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

Author:

Robert Sedgewick, Kevin Wayne

Constructor Summary

Constructors

Constructor	Description
StaticSETofInts(int[] keys)	Initializes a set of integers specified by the integer array.

Method Summary

Modifier and Type	Method	Description
boolean	contains(int key)	Is the key in this set of integers?
int	rank(int key)	Returns either the index of the search key in the sorted array (if the key is in the set) or -1 (if the key is not in the set).

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StaticSETofInts

public StaticSETofInts(int[] keys)

Initializes a set of integers specified by the integer array.

Parameters:

keys - the array of integers

Throws:

IllegalArgumentException - if the array contains duplicate integers

Method Detail

contains

public boolean contains(int key)

Is the key in this set of integers?

Parameters:

key - the search key

Returns:

true if the set of integers contains the key; false otherwise

rank

public int rank(int key)

Returns either the index of the search key in the sorted array (if the key is in the set) or -1 (if the key is not in the set).

Parameters:

key - the search key

Returns:

the number of keys in this set less than the key (if the key is in the set) or -1 (if the key is not in the set).