Given two non-negative integers num1 and num2 rePResented as strings, return the product of num1 and num2.
Note:
The length of bothnum1 and num2 is < 110.Both num1 and num2 contains only digits 0-9.Both num1 and num2 does not contain any leading zero.You must not use any built-in BigInteger library or convert the inputs to integer directly.把字符串轉換為整形數據,然后相乘
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