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In this post, you will find the solution for the **Multiply Strings** **in C++, Java & Python-LeetCode problem**. We are providing the **correct and tested solutions** to coding problems present on **LeetCode**. If you are not able to solve any problem, then you can take help from our Blog/website.

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** Link for the Problem** – Multiply Strings– LeetCode Problem

Multiply Strings – LeetCode Problem

**Problem:**

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.

Multiply Strings– LeetCode Solutions

Multiply Stringsin C++:

class Solution { public: string multiply(string num1, string num2) { string s(num1.length() + num2.length(), '0'); for (int i = num1.length() - 1; i >= 0; --i) for (int j = num2.length() - 1; j >= 0; --j) { const int mult = (num1[i] - '0') * (num2[j] - '0'); const int sum = mult + (s[i + j + 1] - '0'); s[i + j] += sum / 10; s[i + j + 1] = '0' + sum % 10; } const int i = s.find_first_not_of('0'); return i == -1 ? "0" : s.substr(i); } };

Multiply Strings in Java:

class Solution { public String multiply(String num1, String num2) { final int m = num1.length(); final int n = num2.length(); StringBuilder sb = new StringBuilder(); int[] pos = new int[m + n]; for (int i = m - 1; i >= 0; --i) for (int j = n - 1; j >= 0; --j) { final int multiply = (num1.charAt(i) - '0') * (num2.charAt(j) - '0'); final int sum = multiply + pos[i + j + 1]; pos[i + j] += sum / 10; pos[i + j + 1] = sum % 10; } for (final int p : pos) if (p > 0 || sb.length() > 0) sb.append(p); return sb.length() == 0 ? "0" : sb.toString(); } }

Multiply Strings in Python:

class Solution: def multiply(self, num1: str, num2: str) -> str: s = [0] * (len(num1) + len(num2)) for i in range(len(num1) - 1, -1, -1): for j in range(len(num2) - 1, -1, -1): mult = int(num1[i]) * int(num2[j]) summ = mult + s[i + j + 1] s[i + j] += summ // 10 s[i + j + 1] = summ % 10 for i, c in enumerate(s): if c != 0: break return ''.join(map(str, s[i:]))

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