Problem 4: Largest palindrome product
A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.
Find the largest palindrome made from the product of two n-digit numbers.
Solution:
function largestPalindromeProduct(n) {
let maxN = 10**n - 1;
let minN = 10**(n-1);
let arr = []
for(let i=maxN;i>=minN;i--) {
for(let j=maxN;j>=minN;j--) {
let prod = i * j;
isPalin(prod) && arr.push(prod)
}
}
console.log(Math.max(...arr))
return Math.max(...arr);
}
function isPalin(n) {
let num = (n).toString();
let revNum = num.split("").reverse().join("");
return num === revNum
}
largestPalindromeProduct(2);
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