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PeopleQueue.cs
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PeopleQueue.cs
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//-----------------------------------------------------------------------
// <author>Pajace Chen</author>
// <email>pajace@gmail.com</email>
//----------------------------------------------------------------------
using System;
using System.Collections.Generic;
namespace Leecodeoj
{
/// <summary>
/// 問題描述:
/// 有 totalPerson 個人在排隊,從第 startPerson 開始(含),每隔 interval 取一人,共取 countOfSelected 個人
/// 若遇到最後一個則接著第一個往下數
/// 例如:有10個人排隊 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
/// 從第 2 個人開始, 每個 4 人取一個, 共取 5 位
/// 則選取到的人為 [2, 6, 10, 5, 1]
/// </summary>
public class PeopleQueue
{
/// <summary>
/// 排隊問題
/// </summary>
/// <param name="totalPerson">排隊總人數</param>
/// <param name="startPerson">開始位置</param>
/// <param name="interval">間隔人數</param>
/// <param name="countOfSelected">總共選取人數</param>
/// <returns></returns>
public static int[] Select(int totalPerson, int startPerson, int interval, int countOfSelected)
{
List<int> personList = new List<int>();
int[] selectedPerson = new int[countOfSelected];
InitialPersonList(totalPerson, personList);
int selectedIndex = startPerson - 1;
for (int i = 0; i < countOfSelected; i++)
{
selectedPerson[i] = personList[selectedIndex];
personList.RemoveAt(selectedIndex);
selectedIndex--;
selectedIndex = GetNextPersonIndex(interval, personList.Count, selectedIndex);
}
return selectedPerson;
}
private static int GetNextPersonIndex(int interval, int countOfPersonList, int currentSelectedIndex)
{
currentSelectedIndex += interval;
currentSelectedIndex %= countOfPersonList;
return currentSelectedIndex;
}
private static void InitialPersonList(int totalPerson, List<int> personList)
{
for (int i = 0; i < totalPerson; i++)
personList.Add((i + 1));
}
}
}