# [Solved] 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. ## Question

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.

## Python Solution

```class Solution:
def multiply(self, num1: str, num2: str) -> str:
d = {'0':0, '1':1, '2':2, '3':3, '4':4, '5':5, '6':6, '7':7, '8':8, '9':9}

n1=0
n2=0

for i in num1:
n1 = n1*10 + d[i]

for i in num2:
n2 = n2*10 + d[i]

return str(n1*n2)```
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