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  1. Sherlock and Anagrams
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Sherlock and Anagrams

  • jimiwills
     + 0 comments
    public static int sherlockAndAnagrams(string s)
{
    var allAnagrammaticPairs = 0;
    for(var l = 1; l < s.Length; l++){
        var d = new Dictionary<string, int>();
        for(var i=0; i<s.Length-l+1; i++){
            var ss = new string(s.Substring(i, l).ToCharArray().Order().ToArray());
            if(! d.ContainsKey(ss)) d[ss] = 0;
            d[ss]++;
        }
        var v = d.Values.Where(x => x > 1);
        var combinations = v.Select(x => (x-1)*x/2);
        allAnagrammaticPairs += combinations.Sum();
    }
    return allAnagrammaticPairs;
}