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/*
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Copyright (c) 2003-2008 Niels Kokholm and Peter Sestoft
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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// C5 example: Decrease key and increase key pattern chapter
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// Compile with
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// csc /r:C5.dll DecreaseIncreaseKey.cs
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using System;
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using C5;
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using SCG = System.Collections.Generic;
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class MyTest {
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public static void Main(String[] args) {
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IPriorityQueue<Prio<String>> pq = new IntervalHeap<Prio<String>>();
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IPriorityQueueHandle<Prio<String>> h1, h2, h3;
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h1 = h2 = h3 = null;
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pq.Add(ref h1, new Prio<String>("surfing", 10));
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pq.Add(ref h2, new Prio<String>("shopping", 6));
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pq.Add(ref h3, new Prio<String>("cleaning", 4));
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// The following is legal because +, - are overloaded on (Prio<D>,int):
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pq[h2] -= 5;
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pq[h1] += 5;
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while (!pq.IsEmpty)
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Console.WriteLine(pq.DeleteMin());
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}
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}
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struct Prio<D> : IComparable<Prio<D>> where D : class {
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public readonly D data;
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private int priority;
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public Prio(D data, int priority) {
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this.data = data;
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this.priority = priority;
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}
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public int CompareTo(Prio<D> that) {
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return this.priority.CompareTo(that.priority);
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}
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public bool Equals(Prio<D> that) {
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return this.priority == that.priority;
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}
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public static Prio<D> operator+(Prio<D> tp, int delta) {
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return new Prio<D>(tp.data, tp.priority + delta);
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}
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public static Prio<D> operator-(Prio<D> tp, int delta) {
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return new Prio<D>(tp.data, tp.priority - delta);
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}
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public override String ToString() {
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return String.Format("{0}[{1}]", data, priority);
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}
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}
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