private static char[] ReverceReplaceMap(IReadOnlyList <char> replace_map)
{
var reverce = new char[replace_map.Count];
for (var i = 0; i < replace_map.Count; i++)
{
var c = replace_map[i];
reverce[AbcRus.ToIndex(c)] = AbcRus.FromIndex(i);
}
return(reverce.ToArray());
}
public static string FrequencyDecode(string input, string key)
{
var fileText = File.ReadAllText("VoinaIMir.txt");
var table_target = BuildFrequencyTable(fileText);
var table_source = BuildFrequencyTable(input);
var replace_map = new char[AbcRus.Size];
for (var i = 0; i < replace_map.Length; i++)
{
var index = table_target.FindIndex(x => x.Item1 == i);
replace_map[i] = AbcRus.FromIndex(table_source[index].Item1);
}
return(ReplaceString(input, replace_map));
}
private static string ReplaceString(string input, IReadOnlyList <char> replace_map)
{
var result = "";
foreach (var c in input)
{
if (AbcRus.IsValid(c))
{
result = result + replace_map[AbcRus.ToIndex(c)];
}
else
{
result = result + c;
}
}
return(result);
}
private static List <Tuple <int, long> > BuildFrequencyTable(string Text)
{
var table = new Dictionary <int, long>();
for (var i = 0; i < AbcRus.Size; i++)
{
table.Add(i, 0);
}
foreach (var c in Text)
{
if (AbcRus.IsValid(c))
{
table[AbcRus.ToIndex(c)]++;
}
}
return(table.Select(x => Tuple.Create(x.Key, x.Value)).OrderBy(x => x.Item2).ToList());
}