Discussion on Modified Kaprekar Numbers Challenge

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2 weeks ago+ 0 comments

My Java Solution

    public static void kaprekarNumbers(int p, int q) {
    // Write your code here
    boolean Found=false;
    for(int i=p;i<=q;i++){
       
        int temp=i;
        String str=Integer.toString(temp);
        int len=str.length();       
        BigInteger I=new BigInteger(str);
        BigInteger N=I.multiply(I);
        String str2=N.toString();
        int len2=str2.length();
        if(len2==1){
            if(N.equals(I)){
                    System.out.print(i+" ");
            Found=true;
            }
        }else{
        int num1=Integer.parseInt(str2.substring(0, len2-len));
        int num2=Integer.parseInt(str2.substring(len2-len, len2));
        if((num1+num2)==i){
            System.out.print(i+" ");
            Found=true;
        }
        }}
        if(!Found){
            System.out.println("INVALID RANGE");
        }
    }

2 weeks ago+ 0 comments

Java Solution

public static void kaprekarNumbers(int p, int q) {
// Write your code here
int flag=0;
for(long i=p;i<=q;i++){
    if(i==1){
        System.out.print(1+" ");
        flag=1;
    }
    long sq= i*i;
    String iVal=String.valueOf(i);
    long ilen=iVal.length();
    String sqVal=String.valueOf(sq);
    long sqlen=sqVal.length();
    if(sqlen==1){
        continue;
    }
    String rt=sqVal.substring(sqVal.length()-(int)ilen, sqVal.length());
    String lt=sqVal.substring(0, sqVal.length()-(int) ilen);
    long sm=Long.valueOf(rt)+Long.valueOf(lt);
    if(sm==i){
        System.out.print(i+" ");
        flag=1;
    }

}
if(flag==0){
    System.out.println("INVALID RANGE");
}

}

3 weeks ago+ 0 comments

Python3 solution

def kaprekarNumbers(p, q):
        nums = []
        for i in range(p,q+1):
                d, sq = len(str(i)) ,str(i**2)
                if i ==1 or(len(str(i*i))> d and i == int(sq[-d:])+int(sq[:-d]) and int(sq[d:])!=0):
                        nums.append(i)
        if len(nums) == 0:
                print('INVALID RANGE')
        else:               
                print(*nums, end="")

3 weeks ago+ 0 comments

in python3;

def kaprekarNumbers(p, q):
    lst = []
    for i in range(p, q+1):
        sq = i**2
        d = len(str(i))
        r = str(sq)[-d:]
        l = str(sq)[:-d]
        if l == '': l = 0   
        if int(l) + int(r) == i:
            lst.append(i)
    if len(lst) == 0:
        print('INVALID RANGE')
    else:
        print(*lst)

3 weeks ago+ 0 comments

i dont know whats wrong with my code?

public static void kaprekarNumbers(int p, int q) {
    // Write your code here
        for (int i = p; i < q; i++) {
            if (checkResult(i))
                System.out.print(i + " ");
        }
    }
        private static boolean checkResult(int n) {
        int temp = n;
        n = n * n;
        int c = count(n);
        int length = c / 2;
//        System.out.println(length);
        String r = "";
        while (length > 0) {
            int d = n % 10;
            r = d + r;
            n = n / 10;
            length--;
        }
        int res = Integer.parseInt(r) + n;
        if (res == temp)
            return true;
        else
            return false;
    }
        private static int count(int n) {
        int c = 0;
        do {
            c++;
            n = n / 10;
        } while (n != 0);
        return c;
    }

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