zoukankan      html  css  js  c++  java
  • Counting sheep...

    Counting sheep...

    Description:

    Consider an array of sheep where some sheep may be missing from their place. We need a function that counts the number of sheep present in the array (true means present).

    For example,

    [true,  true,  true,  false,
      true,  true,  true,  true ,
      true,  false, true,  false,
      true,  false, false, true ,
      true,  true,  true,  true ,
      false, false, true,  true]

    using System;
    
    public static class Kata
    {
      public static int CountSheeps(bool[] sheeps)
      {
        int count = 0;
        for(int i = 0; i < sheeps.Length; i++) {
          if (sheeps[i]) count++;
        }
        return count;
      }
    }


    比较好的方法,是使用Linq
    using System;
    using System.Linq;
    
    public static class Kata
    {
      public static int CountSheeps(bool[] sheeps)
      {
        return sheeps.Count(s => s);
      }
    }

    Array类的扩展方法Count

    public static int Count<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);

     


    http://www.codeproject.com/Articles/383749/How-does-it-work-in-Csharp-Part-Csharp-LINQ-in-d

    In .NET any data structure which is derived from the IEnumerable<T> interface of the System.Collections.Generic namespace of the mscorlib.dll (this assembly is located in C:WindowsMicrosoft.NETFrameworkv4.0.30319 but depends on the installation of the VS) assembly is able to access all the extension methods defined in the Enumerable class of the System.Linq namespace of the System.Core.dll assembly in the .NET Framework (see more about LINQ). This Enumerable class is a static non inheritable class defined in the System.Linq namespace of the System.Core.dll assembly(C:WindowsMicrosoft.NetassemblyGAC_MSILSystem.Corev4.0_4.0.0.0__b77a5c561934e089System.Core.dll but depends on the installation of VS). The definition of the Enumerbale class is as below:







  • 相关阅读:
    区间dp体会
    P1083借教室 noip提高组复赛2012
    P2678跳石头体会 noip2015提高组
    tarjan求LCA的体会
    P1006 传纸条
    P1140 相似基因 详解
    UVA1025 城市里的间谍 A Spy in the Metro 题解
    DAG上的动规嵌套矩形问题(含思考题)
    洛谷P1030c++递归求解先序排列
    Test 2019.7.22
  • 原文地址:https://www.cnblogs.com/chucklu/p/4597548.html
Copyright © 2011-2022 走看看