6 lines
170 B
C#
6 lines
170 B
C#
public static ulong Fib(uint n) {
|
|
var M = new Matrix(1,0,0,1);
|
|
var N = new Matrix(1,1,1,0);
|
|
for (uint i = 1; i < n; i++) M *= N;
|
|
return (ulong)M[0][0];
|
|
}
|