C#练习题答案: scytale的编码器/解码器（古斯巴达密码）【难度：3级】--景越C#经典编程题库,1000道C#基础练习题等你来挑战
2024-05-28 21:31:14
scytale的编码器/解码器(古斯巴达密码)【难度:3级】:
答案1:
using System;
using System.Linq;
using System.Text.RegularExpressions;
namespace Scytale
{public class Scytale {public static string Decode(string m, int c) {m = m.Length%c == 0 ? m : m + new string(' ', c - m.Length%c); return new Regex(@"\s+$").Replace(string.Concat(m.Select((e,i)=> m[(int)(i/Math.Round((double)m.Length/c))+ i%((int)Math.Round((double)m.Length/c))*c] )),""); }public static string Encode(string m, int c) {string n = m.Length%c == 0 ? m : m + new string(' ', c - m.Length%c); return string.Concat(n.Select((e,i)=> n[(int)(i/c) + (int)(i*(Math.Round((double)n.Length/c)))%n.Length] ));}}
}答案2:
using System;
using System.Linq;
using System.Text.RegularExpressions;
namespace Scytale
{public class Scytale{public static string Decode(string m, int n){var e=Regex.Matches(m,".{1,"+n+"}").OfType<Match>().Select(x=>x.Value).ToArray();return string.Join("",Enumerable.Range(0,n).Select((x,i)=>e.Aggregate("",(a,b)=>i<b.Length ? a+b[i] : a))).Trim();}public static string Encode(string m, int n){if (m=="") return "";if(m.Length%n!=0) m+=new string(' ',n-m.Length%n-1);var len=(m.Length+1)/n;var e=Regex.Matches(m,".{1,"+len+"}").OfType<Match>().Select(x=>x.Value).ToArray();return string.Join("",Enumerable.Range(0,len).Select((x,i)=>e.Aggregate("",(a,b)=>i<b.Length ? a+b[i] : a)));}}
}答案3:
using System;namespace Scytale
{public class Scytale{public static string Decode(string message, int cylinderSides){string res = "";for (int i = 0; i < cylinderSides; i++)for (int j = i; j < message.Length; j += cylinderSides)res = res + message[j];while (res.Length - 1 > 0 && res[res.Length - 1] == ' ')res = res.Remove(res.Length - 1, 1);return res;}public static string Encode(string message, int cylinderSides){string res = "";while (message.Length % cylinderSides != 0)message = message + " ";for (int i = 0; i < message.Length / cylinderSides; i++)for (int j = i; j < message.Length; j+= message.Length / cylinderSides)res = res + message[j];return res;}}
}答案4:
using System;
using System.Text;namespace Scytale
{public class Scytale{ public static string Decode(string message, int cylinderSides){StringBuilder sb = new StringBuilder();for (int i = 0; i < cylinderSides; i++){for (int j = 0; j < message.Length; j += cylinderSides){if ( sb.Length < message.Length){if (i + j < message.Length){sb.Append(message[i + j]);}else{sb.Append(" ");}}}}return sb.ToString().TrimEnd();}public static string Encode(string message, int cylinderSides){//Num Cols = message length / cylinder sides rounded updecimal cl =(decimal) message.Length /(decimal) cylinderSides;int cols = (int) Math.Ceiling(cl);int rows = cylinderSides;char[,] _scytale = new char[cols, rows];// wrap messagefor (int r = 0; r < rows; r++){for (int c = 0; c < cols; c++){if ((cols * r) + c < message.Length){_scytale[c, r] = message[(cols * r) + c];}else{_scytale[c, r] = ' ';}}}StringBuilder sb = new StringBuilder();for (int c = 0; c < cols; c++){for (int r = 0; r < rows; r++){sb.Append(_scytale[c, r]);}}return sb.ToString().TrimEnd();}}
}答案5:
namespace Scytale {public class Scytale {public static string Decode(string message, int cylinderSides) {return EncodeOrDecode(message, cylinderSides, false);}public static string Encode(string message, int cylinderSides) {return EncodeOrDecode(message, cylinderSides, true);}private static string EncodeOrDecode(string message, int cylinderSides, bool encode) {var length = ((message.Length - 1) / cylinderSides) + 1;message = message.PadRight(length * cylinderSides);var shift = encode ? length : cylinderSides;var output = "";for (var i = 0; i < shift; i++) {for (var j = i; j < message.Length; j += shift) {output += message[j];}}return output.Trim();}}
}答案6:
using System;
using System.Collections.Generic;
using System.Linq;namespace Scytale
{public static class Scytale{public static string Decode(string message, int cylinderSides){//! Example: Message has 21 letters for a 6 cylinder scytale.//! Since 21 % 6 = 1 != 0, the message will need ceil(21 / 6) = 4 strips.//! Only 21 % 6 = 1 of those strips will be filled with 6 letters, the rest will have 5.// Calculate the number of strips.// If remainderStrips == 0 all strips are full (i.e. the message divided fully into the cylinder).// Otherwise, we need to add 1 since integer division does floor, and we need ceil.var noOfStrips = Math.DivRem(message.Length, cylinderSides, out var remainderStrips);if (remainderStrips > 0) noOfStrips++;// Create jagged arrays for the rows.var rows = Enumerable.Repeat(0, cylinderSides).Select(_ => new List<char>()).ToList();// Iterate throught the message and assign each letter to the appropriate row.for (int i = 0; i < message.Length; i++)rows[i % cylinderSides].Add(message[i]);// Join rows to create the message. Trim the ends.return string.Concat(rows.SelectMany(r => r)).TrimEnd();}public static string Encode(string message, int cylinderSides){// See Decode for explanation of counting strips.var noOfStrips = Math.DivRem(message.Length, cylinderSides, out var remainderStrips);if (remainderStrips > 0){noOfStrips++;// We also want to pad with spaces here so that it wraps correctly at the bottom row.message = message.PadRight(noOfStrips * cylinderSides);}// Create fixed arrays for the strips.var strips = Enumerable.Repeat(0, noOfStrips).Select(_ => new char[cylinderSides]).ToList();// Iterate throught the message and assign each letter to the appropriate location of each strip.for (int i = 0; i < message.Length; i++){var rowInd = Math.DivRem(i, noOfStrips, out var stripInd);strips[stripInd][rowInd] = message[i];}// Join rows to create the message. DON'T Trim the ends since spaces are important in the final strip.return string.Concat(strips.Select(r => new string(r)));}}
}答案7:
using System;
using System.Collections.Generic;
using System.Linq;namespace Scytale
{public class Scytale{private static void PrintRows(List<List<char>> rows){if (rows.Count == 0 || rows[0].Count == 0) return;var first = true;var noOfStrips = rows[0].Count;var bar = string.Concat(Enumerable.Repeat('-', 2 * noOfStrips - 1));foreach (var row in rows){if (first)first = false;elseConsole.WriteLine(bar);var rowToPrint = row.ToList();while (rowToPrint.Count < noOfStrips)rowToPrint.Add(' ');Console.WriteLine(string.Join("|", rowToPrint));}}public static string Decode(string message, int cylinderSides){//! Example: Message has 21 letters for a 6 cylinder scytale.//! Since 21 % 6 = 1 != 0, the message will need ceil(21 / 6) = 4 strips.//! Only 21 % 6 = 1 of those strips will be filled with 6 letters, the rest will have 5.// Calculate the number of strips.// If remainderStrips == 0 all strips are full (i.e. the message divided fully into the cylinder).// Otherwise, we need to add 1 since integer division does floor, and we need ceil.var noOfStrips = Math.DivRem(message.Length, cylinderSides, out var remainderStrips);if (remainderStrips > 0) noOfStrips++;// Create jagged arrays for the rows.var rows = Enumerable.Repeat(0, cylinderSides).Select(_ => new List<char>()).ToList();// Iterate throught the message and assign each letter to the appropriate row.for (int i = 0; i < message.Length; i++)rows[i % cylinderSides].Add(message[i]);PrintRows(rows);Console.WriteLine($"D (before) [{message.Length}]: \"{message}\"");// Join rows to create the message. Trim the ends.message = string.Concat(rows.SelectMany(r => r)).TrimEnd();Console.WriteLine($"D (after) [{message.Length}]: \"{message}\"");return message;}private static void PrintStrips(List<char[]> strips){if (strips.Count == 0 || strips[0].Length == 0) return;var noOfRows = strips[0].Length;var bar = string.Concat(Enumerable.Repeat('-', 2 * strips.Count - 1));for (int i = 0; i < noOfRows; i++){if (i > 0) Console.WriteLine(bar);var rowToPrint = strips.Select(s => i < s.Length ? s[i] : ' ');Console.WriteLine(string.Join("|", rowToPrint));}}public static string Encode(string message, int cylinderSides){// See Decode for explanation of counting strips.var noOfStrips = Math.DivRem(message.Length, cylinderSides, out var remainderStrips);if (remainderStrips > 0){noOfStrips++;// We also want to pad with spaces here so that it wraps correctly at the bottom row.message = message.PadRight(noOfStrips * cylinderSides);}// Create fixed arrays for the strips.var strips = Enumerable.Repeat(0, noOfStrips).Select(_ => new char[cylinderSides]).ToList();// Iterate throught the message and assign each letter to the appropriate location of each strip.for (int i = 0; i < message.Length; i++){var rowInd = Math.DivRem(i, noOfStrips, out var stripInd);strips[stripInd][rowInd] = message[i];}PrintStrips(strips);Console.WriteLine($"E (before) [{message.Length}]: \"{message}\"");// Join rows to create the message. DON'T Trim the ends since spaces are important in the final strip.message = string.Concat(strips.Select(r => new string(r)));Console.WriteLine($"E (after) [{message.Length}]: \"{message}\"");return message;}}
}答案8:
using System;
using System.Linq;namespace Scytale
{public class Scytale{public static string Decode(string message, int cylinderSides){string output = "";int i = 0;while (i < cylinderSides){output += new String(message.Where((s, index) => index % cylinderSides == i).ToArray());i++;}return output.TrimEnd(' ');}public static string Encode(string message, int cylinderSides){string output = "";int newLen=message.Length;while (newLen % cylinderSides != 0)newLen++;string tmpStr = message.PadRight(newLen, ' ');int lineLength = tmpStr.Length / cylinderSides;int i = 0;while (i < lineLength){output += new String(tmpStr.Where((s, index) => index % lineLength == i).ToArray());i++;}return output;}}
}答案9:
using System;
using System.Linq;
using System.Collections.Generic;namespace Scytale
{public class Scytale{public static string Decode(string message, int cylinderSides){Console.WriteLine($"Decode message: {message} cylinderSides: {cylinderSides}");var list = new List<char>();var blocks = message.Length % cylinderSides == 0 ? message.Length / cylinderSides : message.Length / cylinderSides + 1;for (var offset = 0; offset < cylinderSides; offset++) {for (var index = 0; index < blocks; index++) {var realIndex = offset + index * cylinderSides;if (realIndex < message.Length) {list.Add(message[realIndex]);}}}return new string(list.ToArray()).TrimEnd();}public static string Encode(string message, int cylinderSides){Console.WriteLine($"Encode message: {message} cylinderSides: {cylinderSides}");var blocks = message.Length % cylinderSides == 0 ? message.Length / cylinderSides : message.Length / cylinderSides + 1;var list = new List<char>();for (var offset = 0; offset < blocks ; offset++) {for (var index = 0; index < cylinderSides; index++) {var realIndex = offset + index * blocks;list.Add(realIndex < message.Length ? message[realIndex] : ' ');}}return new string(list.ToArray());}}
}答案10:
namespace Scytale {using System;using System.Collections.Generic;using System.Text;public class Scytale {public static string Decode( string message, int cylinderSides ) {return EncodeDecode( message, cylinderSides, true );}public static string Encode( string message, int cylinderSides ) {return EncodeDecode( message, cylinderSides );}private static string EncodeDecode( string message, int cylinderSides, bool decode = false ) {var wordLength = (int) Math.Ceiling( message.Length/(double) cylinderSides );message += new string( ' ', wordLength*cylinderSides - message.Length );var words = new List<string>( );var j = 0;var n = cylinderSides;var m = wordLength;if ( decode ) {n = wordLength;m = cylinderSides;}for ( int i = 0; i < n; i++ ) {var s = message.Substring( j, m );j += m;words.Add( s );}var result = new StringBuilder( );for ( int i = 0; i < m; i++ ) {foreach ( var w in words ) {result.Append( w[ i ] );}}return result.ToString( ).Trim( );}}
}C#练习题答案: scytale的编码器/解码器（古斯巴达密码）【难度：3级】--景越C#经典编程题库,1000道C#基础练习题等你来挑战相关推荐
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