Exercise 4

public class cn {
    public static void main(String[] args) {
        int [] arr = {1, 2, 2, 3, 3, 3, 2, 2, 2, 5, 7,7, 1};
        int [] length = new int [arr.length];
        for(int i = 0; i < arr.length; i++){
            int count = 1;
            for(int j = i + 1; j < arr.length; j++){
                if(arr[i] == arr[j]){
                    count++;
                    length[j] = -1;
                }
            }
            if(length[i] != -1)
                length[i] = count;
        }
        System.out.println(" Number  |  Times");
        for(int i = 0; i < length.length; i++){
            if(length[i] != -1)
                System.out.println("    " + arr[i] + "    |    " + length[i]);
        }
    }
}