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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
namespace DesignCompressedStringIterator
{
class Program
{
static void Main(string[] args)
{
var obj = new StringIterator("L1e2t1C1o1d1e1");
Console.WriteLine(obj.Next());
Console.WriteLine(obj.Next());
Console.WriteLine(obj.Next());
Console.WriteLine(obj.Next());
Console.WriteLine(obj.Next());
Console.WriteLine(obj.Next());
Console.WriteLine(obj.HasNext());
Console.WriteLine(obj.Next());
Console.WriteLine(obj.HasNext());
}
}
public class StringIterator
{
private List<char> letters;
private List<long> nums;
private int count;
private int num;
private int p1;
private int p2;
private int sum;
public StringIterator(string compressedString)
{
letters = new List<char>();
nums = new List<long>();
foreach (var character in compressedString)
{
if (Char.IsLetter(character))
{
letters.Add(character);
if (num != 0)
nums.Add(nums.Count == 0 ? num : num + nums[^1]);
sum += num;
num = 0;
}
else
num = num * 10 + (character - '0');
}
nums.Add(nums.Count == 0 ? num : num + nums[^1]);
sum += num;
}
public char Next()
{
if (p2 >= nums.Count)
return ' ';
if (count >= nums[p2])
{
p1++;
p2++;
}
count++;
return p1 < letters.Count ? letters[p1] : ' ';
}
public bool HasNext()
{
return count < sum;
}
}
}