//Given 2 Arrays, Return True if arrays contain common item, else false.
//e.g a= ['a','b','g','c'] and b =['z','e','c'] returns true
//input : 2 arrays
//output: bool
using System.Collections.Generic;
using System.Linq;
public class Kata{
  public static bool ContainsCommonItem(char[] a, char[] b){ //not mine
    for(int i=0;i<a.Length;i++)
      for(int j=0; j< b.Length; j++)
        if(a[i]==b[j])
          return true;
    return false;
  }
  public static bool ContainsCommonItemBetter(char[] a,char[]b){ //not min
    
    HashSet<char> items = new HashSet<char>();
    
    foreach(char item in a)
      items.Add(item);
    for (int i =0; i< b.Length; i++)
      if (items.Contains(b[i]))
        return true;
    return false;
  }
  public static bool ContainsCommonItemMoreSimple(char[] a, char[] b) // mine
  {
      var charsExcistingInBoth = a.Intersect(b);
      return charsExcistingInBoth.Count() > 0? true : false;
  }
  
  public static bool ContainsCommonItemUsingAny(char[] a, char[] b)
  {
      return a.Any(ch => b.Contains(ch));
  }
  
    
}