Leetcode Problem 43. Multiply Strings

43. Multiply Strings

Leetcode Solutions

Approach: Sum the products from all pairs of digits

  1. Reverse both input strings num1 and num2 to simplify the multiplication process.
  2. Initialize an answer array ans of length num1.length + num2.length with all zeros.
  3. Iterate over each digit of num2 using index i.
  4. For each digit of num1 using index j, multiply the digits at num1[j] and num2[i].
  5. Calculate the sum of the product and the current value at ans[i + j], and update ans[i + j] with the ones place of this sum.
  6. Add the carry (tens place of the sum) to ans[i + j + 1].
  7. After completing the multiplication, remove any leading zeros from the answer array.
  8. Reverse the answer array to get the final product as a string.
  9. Return the final product string.
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Approach: Elementary Math

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