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import java.util.Scanner;
public class FibLastDigit {
public static int lastDigitNaive(int n) {
if (n <= 1)
return n;
return (lastDigitNaive(n - 1) + lastDigitNaive(n - 2)) % 10;
}
public static int lastDigitOptimized(int n) {
if (n <= 1)
return n;
final int[] fibLastDigitArray = new int[n + 1];
fibLastDigitArray[0] = 0;
fibLastDigitArray[1] = 1;
for (int i = 2; i < n + 1; i++) {
fibLastDigitArray[i] = (fibLastDigitArray[i - 1] + fibLastDigitArray[i - 2]) % 10;
}
return fibLastDigitArray[n];
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
System.out.println(lastDigitOptimized(n));
}
}
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