codeHunt参考

我用的是C#

01

using System;
using System.Linq;
public class Program {
    public static int[] Puzzle(int n) {
        return Enumerable.Range(0,n).ToArray();
    }
}

02

using System;
using System.Linq;
public class Program {
    public static int[] Puzzle(int n) {
        return Enumerable.Range(0,n).Select(x => x * n).ToArray();
    }
}

03

using System;
using System.Linq;
public class Program {
    public static int[] Puzzle(int n) {
        return Enumerable.Range(0,n).Select(x => x*x).ToArray();
    }
}

04

using System;
using System.Linq;
public class Program {
    public static int Puzzle(int[] v) {
            return (int)v.Sum(x => (long)x);
    }
}

05

using System;
using System.Linq;
public class Program {
    public static int Puzzle(int n) {
        return Enumerable.Range(0, n).Sum(x => x * x);
    }
}

06

using System;
public class Program {
    public static int Puzzle(string s) {
        return s.Length - s.Replace("a","").Length;
    }
}

07

using System;
public class Program {
    public static int Puzzle(string s, char x) {
        return s.Length -s.Replace("" + x, "").Length;
    }
}