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suppose we have a , b
- Amir February 26, 20131) First produce arr[9] where arr[i]=i*a , (1<=i<=9). we can do it with 9 addition.
2) For each digit in b[i]=k add i zero on right-side of the arr[k] and add them to each other.
The result is a*b.
It is the obvious way that we calculate multiply on paper!
This solution is useful for bignumber multiplication too.