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ADD Climbing-Stairs problem #56

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	`1`	`+using System;`
	`2`	`+`
	`3`	`+public class Solution`
	`4`	`+{`
	`5`	`+ private static int _GetFibonacciNumber(int n)`
	`6`	`+ {`
	`7`	`+ int prev = 1;`
	`8`	`+ int curr = 1;`
	`9`	`+ for (int i = 0; i < n - 1; i++)`
	`10`	`+ {`
	`11`	`+ int temp = curr;`
	`12`	`+ curr += prev;`
	`13`	`+ prev = temp;`
	`14`	`+ }`
	`15`	`+`
	`16`	`+ return curr;`
	`17`	`+ }`
	`18`	`+`
	`19`	`+ public static int ClimbStairs(int n)`
	`20`	`+ {`
	`21`	`+ if (n < 1 \|\| n > 45)`
	`22`	`+ {`
	`23`	`+ return 0;`
	`24`	`+ }`
	`25`	`+`
	`26`	`+ return _GetFibonacciNumber(n);`
	`27`	`+ }`
	`28`	`+`
	`29`	`+ public static void Main(string[] args)`
	`30`	`+ {`
	`31`	`+ Console.WriteLine(ClimbStairs(4));`
	`32`	`+`
	`33`	`+ Console.ReadKey();`
	`34`	`+ }`
	`35`	`+}`
	`36`	`+`

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