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问题描述：五个人打算过一座吊桥，开始时他们都位于该桥的一侧。天很黑，五个人手里只有一个手电筒。该桥一次最多只能同时过两个人，无论是一个人还是两个人过桥，都需要携带手电筒看路。而且手电筒只能通过人携带过桥的方式传递。第一个人过桥需要1分钟时间，第二个人过桥需要2分钟，第三个人需要5分钟，第四个需要7分钟，第五个需要10分钟。由于速度不同，两个人一起过桥的话，速度以慢的人为准。求最快过桥时间。
Main
using System;
using System.Collections.Generic;
using System.Linq;
namespace PassRiver
{
class Program
{
private const int maxPassTogetherCount = 2;
static void Main(string[] args)
{
List<Person> leftPersons = new List<Person>();
List<Person> rightPersons = new List<Person>();
Person p1 = new Person(1);
Person p2 = new Person(2);
Person p3 = new Person(5);
Person p4 = new Person(7);
Person p5 = new Person(10);
leftPersons.Add(p4);
leftPersons.Add(p5);
leftPersons.Add(p1);
leftPersons.Add(p2);
leftPersons.Add(p3);
int totalTime = 0;
while (leftPersons.Count != 0)
{
List<Person> twoFastSpeedPersons = FindTwoFastSpeedPersons(leftPersons);
foreach (Person person in twoFastSpeedPersons)
{
leftPersons.Remove(person);
}
rightPersons.AddRange(twoFastSpeedPersons);
if (twoFastSpeedPersons.Count > 1)
{
totalTime += twoFastSpeedPersons[1].Speed;
}
else if (twoFastSpeedPersons.Count == 1)
{
totalTime += twoFastSpeedPersons[0].Speed;
}
else
{
}
//-------------
Console.WriteLine("---Go To Right---------->");
foreach (Person person in twoFastSpeedPersons)
{
Console.WriteLine(person.Speed);
}
Console.WriteLine("Total Time:" + totalTime);
Console.WriteLine();
//-------------
if (leftPersons.Count == 0 || rightPersons.Count==5)
{
break;
}
Person fastSpeedPerson = FindFastSpeedPerson(rightPersons);
rightPersons.Remove(fastSpeedPerson);
leftPersons.Add(fastSpeedPerson);
totalTime += fastSpeedPerson.Speed;
//-------------
Console.WriteLine("<----------Go Back Left---");
Console.WriteLine(fastSpeedPerson.Speed);
Console.WriteLine("Total Time:" + totalTime);
Console.WriteLine();
//-------------
if (leftPersons.Count == 0 || rightPersons.Count == 5)
{
break;
}
List<Person> twoLowestSpeedPersons = FindTwoLowestSpeedPersons(leftPersons);
foreach (Person person in twoLowestSpeedPersons)
{
leftPersons.Remove(person);
}
rightPersons.AddRange(twoLowestSpeedPersons);
totalTime += twoLowestSpeedPersons[0].Speed;
//-------------
Console.WriteLine("---Go To Right---------->");
foreach (Person person in twoLowestSpeedPersons)
{
Console.WriteLine(person.Speed);
}
Console.WriteLine("Total Time:" + totalTime);
Console.WriteLine();
//-------------
if (leftPersons.Count == 0 || rightPersons.Count == 5)
{
break;
}
fastSpeedPerson = FindFastSpeedPerson(rightPersons);
rightPersons.Remove(fastSpeedPerson);
leftPersons.Add(fastSpeedPerson);
totalTime += fastSpeedPerson.Speed;
//-------------
Console.WriteLine("<----------Go Back Left---");
Console.WriteLine(fastSpeedPerson.Speed);
Console.WriteLine("totalTime:" + totalTime);
Console.WriteLine();
//-------------
if (leftPersons.Count == 0 || rightPersons.Count == 5)
{
break;
}
}
Console.WriteLine("------------Total Time-------------");
Console.WriteLine(totalTime);
Console.ReadKey();
}
public static List<Person> FindTwoLowestSpeedPersons(List<Person> persons)
{
List<Person> sortedPersons = persons.OrderByDescending(s => s.Speed).ToList();
List<Person> passedPersons = new List<Person>();
if (persons.Count > 1)
{
passedPersons = new List<Person>();
passedPersons.Add(sortedPersons[0]);
passedPersons.Add(sortedPersons[1]);
}
else if (persons.Count == 1)
{
passedPersons.Add(sortedPersons[0]);
}
else
{
}
return passedPersons;
}
public static List<Person> FindTwoFastSpeedPersons(List<Person> persons)
{
List<Person> sortedPersons = persons.OrderBy(s => s.Speed).ToList();
List<Person> passedPersons = new List<Person>();
if (persons.Count > 1)
{
passedPersons = new List<Person>();
passedPersons.Add(sortedPersons[0]);
passedPersons.Add(sortedPersons[1]);
}
else if (persons.Count == 1)
{
passedPersons.Add(sortedPersons[0]);
}
else
{
return null;
}
return passedPersons;
}
public static Person FindFastSpeedPerson(List<Person> persons)
{
if (persons.Count > 0)
{
List<Person> sortedPersons = persons.OrderBy(s => s.Speed).ToList();
return sortedPersons[0];
}
else
{
return null;
}
}
}
}
Person
namespace PassRiver
{
public class Person
{
private int _speed;
private Side _side;
public Person(int speed)
{
_speed = speed;
_side = Side.Left;
}
public int Speed
{
get { return _speed; }
set { _speed = value; }
}
public Side Side
{
get { return _side; }
set { _side = value; }
}
}
}
Side
namespace PassRiver
{
public enum Side
{
Left = 0,
Right = 1
}
}
SortUtil
using System.Collections.Generic;
namespace PassRiver
{
public static class SortUtil
{
public static List<Person> BubbleSort(List<Person> persons)
{
for (int i = 0; i < persons.Count - 1; i++)
{
for (int j = i + 1; j < persons.Count; j++)
{
if (persons[i].Speed < persons[j].Speed)
{
Person temp = persons[j];
persons[j] = persons[i];
persons[i] = temp;
}
}
}
return persons;
}
}
}
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原文地址：http://www.cnblogs.com/jackson0714/p/5831998.html
