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Second Largest Digit in a String

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	`1`	`+Link: https://leetcode.com/problems/second-largest-digit-in-a-string/`
	`2`	`+Language: C#`
	`3`	`+`
	`4`	`+`
	`5`	`+`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+public class Solution {`
	`10`	`+ public int SecondHighest(string s)`
	`11`	`+ {`
	`12`	`+ bool[] digits = new bool[10];`
	`13`	`+`
	`14`	`+ for (int i = 0; i < s.Length; i++)`
	`15`	`+ {`
	`16`	`+ if (char.IsDigit(s[i]))`
	`17`	`+ digits[s[i] - '0'] = true;`
	`18`	`+ }`
	`19`	`+`
	`20`	`+ bool largestNumber = false;`
	`21`	`+`
	`22`	`+ for (int i = 9; i >= 0; i--)`
	`23`	`+ {`
	`24`	`+ if (digits[i] && !largestNumber)`
	`25`	`+ largestNumber = true;`
	`26`	`+ else if (digits[i])`
	`27`	`+ return i;`
	`28`	`+ }`
	`29`	`+`
	`30`	`+ return -1;`
	`31`	`+ }`
	`32`	`+}`

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