Missing Test Case - 43. Multiply Strings

[Komal145-web]

LeetCode Username

Komal145-web

Problem Number, Title, and Link

43. Multiply Strings https://leetcode.com/problems/multiply-strings/description/

Bug Category

Problem description, Problem examples, Problem constraints

Bug Description

43. Multiply Strings
Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.

Note: You must not use any built-in BigInteger library or convert the inputs to integer directly.

Example 1:

Input: num1 = "2", num2 = "3"
Output: "6"
Example 2:

Input: num1 = "123", num2 = "456"
Output: "56088"

Constraints:

1 <= num1.length, num2.length <= 200
num1 and num2 consist of digits only.
Both num1 and num2 do not contain any leading zero, except the number 0 itself.

Language Used for Code

Java

Code used for Submit/Run operation

class Solution {
    public String multiply(String num1, String num2) {

        if (num1.equals("0") || num2.equals("0")) return "0";

        int m = num1.length();
        int n = num2.length();
        int[] res = new int[m + n];

        for (int i = m - 1; i >= 0; i--) {
            for (int j = n - 1; j >= 0; j--) {

                int digit1 = num1.charAt(i) - '0';
                int digit2 = num2.charAt(j) - '0';

                int product = digit1 * digit2;

                int posLow = i + j + 1;
                int posHigh = i + j;

                product += res[posLow];  // add existing carry
                
                res[posLow] = product % 10;
                res[posHigh] += product / 10;
            }
        }

        // Convert to string, skip leading zero
        StringBuilder sb = new StringBuilder();
        for (int num : res) {
            if (!(sb.length() == 0 && num == 0)) {
                sb.append(num);
            }
        }

        return sb.toString();
    }
}

Expected behavior

solved

Screenshots

Additional context

No response

[exalate-issue-sync]

oj-leetcode commented: Hi Komal145-web,

Thank you for reaching out regarding your experience with Problem 43: Multiply Strings. We understand how important it is to have clear problem descriptions and examples. To assist you better, could you please provide more details or specify the exact issue you are experiencing with the problem description, examples, or constraints? This information will be greatly helpful in determining if there is indeed an issue on our side or if we can offer further clarification or guidance. We are here to ensure that you have a smooth problem-solving experience.

Thank you for your understanding and patience.

LeetCode Support Team