习题劳尔【难度:1级】:

答案1:

using System.Collections.Generic;
using System.Linq;public partial class Raul
{public static List<string>[] SeparateKeywords(string[] keywords){keywords = keywords.Where(kw => KeywordDictionary.ContainsKey(kw)).ToArray();var cSharpKeywords = keywords.Where(kw => KeywordDictionary[kw] == "C#").OrderBy(a => a).ToList();var footballKeywords = keywords.Where(kw => KeywordDictionary[kw] == "football").OrderBy(a => a).ToList();return new List<string>[] { cSharpKeywords, footballKeywords };}
}​

答案2:

using System.Collections.Generic;
using System.Linq;public partial class Raul
{public static List<string>[] SeparateKeywords(string[] keywords){var result = keywords.Where(e => KeywordDictionary.ContainsKey(e)).GroupBy(e => KeywordDictionary[e]).OrderBy(g => g.Key).Select(g => g.OrderBy(e => e).ToList()).ToArray();List<string> cshaprKeywords = result.Length > 0 ? result[0] : new List<string>();List<string> footballKeywords = result.Length > 1 ? result[1] : new List<string>();return new List<string>[] { cshaprKeywords, footballKeywords };}
}​

答案3:

using System;
using System.Linq;
using System.Collections.Generic;public partial class Raul
{static readonly string[] keywordGroups = {"C#", "football"};public static List<string>[] SeparateKeywords(string[] keywords){ILookup<string, string> groups = keywords.ToLookup(s =>KeywordDictionary.ContainsKey(s) ? KeywordDictionary[s] : null);return keywordGroups.Select(groupName => groups[groupName].OrderBy(x => x).ToList()).ToArray();}
}​

答案4:

using System;
using System.Collections.Generic;
using System.Linq;public partial class Raul
{// return value: array [] of string-Listspublic static List<string>[] SeparateKeywords(string[] keywords){return new List<string>[2]{ keywords.Where(item => KeywordDictionary.ContainsKey(item) &amp;&amp; KeywordDictionary[item] == "C#").OrderBy(item => item).ToList(),keywords.Where(item => KeywordDictionary.ContainsKey(item) &amp;&amp; KeywordDictionary[item] == "football").OrderBy(item => item).ToList() };}
}​

答案5:

using System;
using System.Collections.Generic;public partial class Raul
{public static List<string>[] SeparateKeywords(string[] keys){List<string>[] result=new List<string>[2] {new List<string>(), new List<string>()};string kind;foreach (var k in keys) if (KeywordDictionary.ContainsKey(k)) {if ((kind=KeywordDictionary[k])=="C#") result[0].Add(k); else if (kind=="football") result[1].Add(k);}   result[0].Sort(); result[1].Sort();   return result;}
}​

答案6:

using System.Linq;
using System.Collections.Generic;public partial class Raul
{static readonly string[] KeywordGroups = {"C#", "football"};public static List<string>[] SeparateKeywords(string[] keywords){ILookup<string, string> groups = keywords.ToLookup(s =>KeywordDictionary.ContainsKey(s) ? KeywordDictionary[s] : null);return KeywordGroups.Select(groupName => groups[groupName].OrderBy(x => x).ToList()).ToArray();}
}​

答案7:

using System;
using System.Linq;
using System.Collections.Generic;public partial class Raul
{// private static Dictionary<string, string> KeywordDictionary =//    new Dictionary<string, string> () {};public static List<string>[] SeparateKeywords(string[] keywords){var c = new List<string>() {};var f = new List<string>() {};foreach (var kwd in keywords) {if (KeywordDictionary.ContainsKey(kwd)){var cat = KeywordDictionary[kwd];if(cat == "C#"){c.Add(kwd);} else if (cat == "football"){f.Add(kwd);}}}return new List<string>[] {c.OrderBy(o => o).ToList(),f.OrderBy(o => o).ToList()};}
}​

答案8:

using System;
using System.Collections.Generic;public partial class Raul
{public static List<string>[] SeparateKeywords(string[] keywords){List<string> l1 = new List<string>(){};List<string> l2 = new List<string>(){};foreach( string k in keywords ){if( KeywordDictionary.ContainsKey(k) ){var s = KeywordDictionary[k];if( s=="C#" ){ l1.Add( k ); }if( s=="football" ){ l2.Add( k ); }}}l1.Sort();l2.Sort();return new List<string>[]{ l1, l2 };}
}​

答案9:

using System;
using System.Collections.Generic;
using System.Linq;public partial class Raul
{  public static List<string>[] SeparateKeywords(string[] keywords){var filtered = keywords.Where(kw => KeywordDictionary.ContainsKey(kw));var csharp = filtered.Where(kw => KeywordDictionary[kw] == "C#").ToList();var football = filtered.Where(kw => KeywordDictionary[kw] == "football").ToList();csharp.Sort();football.Sort();return new List<string>[] { csharp, football };}
}​

答案10:

using System.Collections.Generic;
using System.Linq;public partial class Raul
{public static List<string>[] SeparateKeywords(string[] keywords){List<string> sharp = new List<string>();List<string> football = new List<string>();foreach (var val in keywords.OrderBy(x => x)){if (KeywordDictionary.ContainsKey(val)){var value = KeywordDictionary[val];if (value == "C#")sharp.Add(val);elsefootball.Add(val);}}return new List<string>[] { sharp, football };}
}​

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