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Program.cs
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Program.cs
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using System;
namespace MaxDifferenceYouCanGet
{
class Program
{
static void Main(string[] args)
{
int num = 1154;
Console.WriteLine(MaxDiff(num));
}
static int MaxDiff(int num)
{
string strNum = num.ToString();
string num1 = "";
string num2 = "";
bool isChanged = false;
char digit1 = 'a';
char digit2 = 'a';
for (int i = 0; i < strNum.Length; i++)
{
if (!isChanged)
{
if (strNum[i] == '9')
num1 += strNum[i];
else
{
num1 += '9';
digit1 = strNum[i];
isChanged = true;
}
}
else
num1 += strNum[i] == digit1 ? '9' : strNum[i];
}
int index2 = 0;
if (strNum[0] == '1')
{
while (index2 < strNum.Length)
{
if (strNum[index2] == '1' || strNum[index2] == '0')
num2 += strNum[index2];
else
{
num2 += '0';
digit2 = strNum[index2];
index2++;
break;
}
index2++;
}
while (index2 < strNum.Length)
{
num2 += strNum[index2] == digit2 ? '0' : strNum[index2];
index2++;
}
}
else
{
digit2 = strNum[0];
for (int i = 0; i < strNum.Length; i++)
num2 += strNum[i] == digit2 ? '1' : strNum[i];
}
return int.Parse(num1) - int.Parse(num2);
}
}
}