编程题
扑克牌大小
import java.util.Scanner;
@SuppressWarnings({
"all"})
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
String[] pp = str.split("-");
String[] p1 = pp[0].split(" ");
String[] p2 = pp[1].split(" ");
String p = "34567891JQKA2";
if (pp[0].equals("joker JOKER") || pp[1].equals("joker JOKER")) {
System.out.println("joker JOKER");
} else if (p1.length == p2.length) {
if (p.indexOf(p1[0].substring(0, 1)) > p.indexOf(p2[0].substring(0, 1))) {
System.out.println(pp[0]);
} else {
System.out.println(pp[1]);
}
} else if (p1.length == 4) {
System.out.println(pp[0]);
} else if (p2.length == 4){
System.out.println(pp[1]);
} else {
System.out.println("ERROR");
}
}
}
完全数计算
import java.util.Scanner;
@SuppressWarnings({
"all"})
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
int n = sc.nextInt();
int count = 0;
for (int i = 2; i <= n; i++) {
int sum = 0;
for (int j = 2; j <= Math.sqrt(i); j++) {
if (i % j == 0) {
if (i / j == j) {
sum += j;
} else {
sum = sum + j + i / j;
}
}
}
if (sum + 1 == i) {
count++;
}
}
System.out.println(count);
}
}
}