FrequencyOfDigits.java

/*
Q15: Frequency of Digits [Medium]
- Input: 112233
Output: 1→2, 2→2, 3→2
- Input: 1002003
Output: 0→3, 1→1, 2→1, 3→1 
*/
package week2;
import java.util.Scanner;
public class FrequencyOfDigits {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n=sc.nextInt();
		int arr[] = new int[10];
		int digit;
		while(n >0) {
			digit = n % 10;
			switch(digit) {
			case 0:
				arr[0]++;
				break;
			case 1:
				arr[1]++;
				break;
			case 2:
				arr[2]++;
				break;
			case 3:
				arr[3]++;
				break;
			case 4:
				arr[4]++;
				break;
			case 5:
				arr[5]++;
				break;
			case 6:
				arr[6]++;
				break;
			case 7:
				arr[7]++;
				break;
			case 8:
				arr[8]++;
				break;
			case 9:
				arr[9]++;
				break;
			}
			n /=10;
		}
		for(int i=0; i<=9; i++) {
			if(arr[i] != 0) {
				System.out.print(i+"->"+ arr[i]+" ");
			}
		}
		sc.close();
	}
}