Project Euler : Problem 4

Problem

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A palindromic number reads the same both ways. The largest palindrome made from the product of two $2$-digit numbers is $9009 = 91 \times 99$.

Find the largest palindrome made from the product of two $3$-digit numbers.

Solution

The answer is: 906609

The execution took: 20.5 milliseconds

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Explaination

Search all three digit numbers with an efficient ordered set indexing. Convert the product to a string. Check if it is a palindrome. Store the largest palindrome.