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Solution.cs

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public class Solution

{

public int MaxDiff(int num)

{

string numStr = num.ToString();

int n = numStr.Length;

int ret = 0;

char maxMap = '9';

int maxVal = 9;

for (int i = 0; i < n; i++)

{

if (maxMap == '9') maxMap = numStr[i];

}

char minMap = numStr[0];

int minVal = 0;

if (numStr[0] != '1')

{

minMap = numStr[0];

minVal = 1;

}

else

{

for (int i = 1; i < n; i++)

{

if (minMap == '1' || minMap == '0') minMap = numStr[i];

}

if (minMap == '1' && minVal == 0) minVal = 1;

}

for (int i = 0; i < n; i++)

{

int max = numStr[i] - '0', min = numStr[i] - '0';

if (numStr[i] == maxMap) max = maxVal;

if (numStr[i] == minMap) min = minVal;

ret = ret * 10 + (max - min);

}

return ret;

}

}