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- import java.util.*;
- public class Main {
- public static int keraaLuvut(int[] luvut) {
- int kierros = 1;
- boolean[] pieru = new boolean[luvut.length + 1];
- pieru[luvut[0]] = true;
- for (int k = 1; k < luvut.length; k++) {
- if (!pieru[luvut[k] - 1]) {
- kierros++;
- }
- pieru[luvut[k]] = true;
- }
- return kierros;
- }
- public static void main(String[] args) {
- System.out.println(keraaLuvut(new int[]{1, 2, 3, 4, 5}));
- System.out.println(keraaLuvut(new int[]{5, 1, 2, 3, 4}));
- System.out.println(keraaLuvut(new int[]{5, 4, 3, 2, 1}));
- System.out.println(keraaLuvut(new int[]{1, 5, 2, 4, 3}));
- }
- }
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