javascript - LeetCode: 1281. Subtract the Product and Sum of Digits of an Integer - Stack Overflow

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I have been trying to figure out this question from LeetCoode. This is the problem: Given an integer number n, return the difference between the product of its digits and the sum of its digits.

This is my code so far:

/**
 * @param {number} n
 * @return {number}
 */
//n=234
var subtractProductAndSum = function(n) {
    var z= n.toString().length;
    var g= n.toString()
    for(var i=0; i<z; i++){
      var p= g[i]+g[i+1]+g[i+2];
    var y=g[i]*g[i+1]*g[i+2];
        var d= y-p
    }
    return d;
};

I have been trying to figure out this question from LeetCoode. This is the problem: Given an integer number n, return the difference between the product of its digits and the sum of its digits.

This is my code so far:

/**
 * @param {number} n
 * @return {number}
 */
//n=234
var subtractProductAndSum = function(n) {
    var z= n.toString().length;
    var g= n.toString()
    for(var i=0; i<z; i++){
      var p= g[i]+g[i+1]+g[i+2];
    var y=g[i]*g[i+1]*g[i+2];
        var d= y-p
    }
    return d;
};

• javascript
• numbers
• digits

Share Improve this question Follow edited Nov 25, 2021 at 6:54 Mureinik 313k5454 gold badges364364 silver badges392392 bronze badges asked Dec 31, 2019 at 17:10 Just_A_Kid_Seeking4HelpJust_A_Kid_Seeking4Help 4111 silver badge22 bronze badges

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6 Answers 6

Sorted by: Reset to default 1

Your solution assumes the number has three digits, which is probably not what the problem intended.

I'd run over the number and extract the digits one by one, and sum and multiply them as I go. Then, just subtract the two:

var subtractProductAndSum = function(n) {
    // Initialize the sum and the product with neutral values
    var sum = 0;
    var product = 1;

    while (n > 0) {
        var digit = n % 10;
        sum += digit;
        product *= digit;

        n = Math.floor(n / 10);
    }

    return product - sum;
};

You can convert the integer into a string and then split it. Then using the array of digit strings, find the product of the digits and the sum of the digits by using the reduce function like so:

const subtractProductAndSum = function(n) {
  const digitArray = n.toString().split('')
  const digitProduct = digitArray.reduce((previousValue, currentValue) => previousValue * parseInt(currentValue), 1)
  const digitSum = digitArray.reduce((previousValue, currentValue) => previousValue + parseInt(currentValue), 0)
  return digitProduct - digitSum
}

You can try

/**
 * @param {number} n
 * @return {number}
 */
//n=234
var subtractProductAndSum = function(n) {
let product = (n+"").split("").reduce((total,curr)=>total * +curr,1);
let sum = (n+"").split("").reduce((total,curr)=>total + +curr,0);

return product - sum;
};

or

/**
 * @param {number} n
 * @return {number}
 */
//n=234
var subtractProductAndSum = function(n) {
let  product = 1;
let sum = 0;
n = n+"";

for(let  i = 0; i < n.length; i++){
product *= +n[i];
sum += +n[i];
}

return product - sum;
};

See the following :

/**
 * @param {number} n
 * @return {number}
 */
//n=234
var subtractProductAndSum = function(n) {
    var digits = n.split('');
    //console.log(digits);
    var prod = digits.reduce((a, b) => a * parseInt(b), 1);
    //console.log(prod);
    var sum = digits.reduce((a, b) => a + parseInt(b), 0);
    //console.log(sum);
    //console.log(prod - sum);
    return prod - sum;
};

subtractProductAndSum('234');

//it's working on IntelliJ
public class SubofProSum {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int sum,product,n,value,sub;
        sum = 0;
        product = 1;
        n= in.nextInt();

        while(n>0){
            value=n%10;
            sum = sum+value;
            product = product * value;
            n = n /10;
        }
        System.out.println("sum is: "+sum+" \nMultiple is: "+product);
        sub=product-sum;
        System.out.println("sub is:"+sub);
    }
}

I have solved the same question in Java. I used the modulus operator (%) to pute the last digit, and the code snippet is given below.

public int subtractProductAndSum(int n) {

   int productOfDigits = 1;
    int sumOfDigits = 0;
    while (n > 0) {
        int lastDigit = n % 10;
        productOfDigits *= lastDigit;
        sumOfDigits += lastDigit;
        n /= 10;
    }
    return productOfDigits - sumOfDigits;
}

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