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Solved Find the greatest product of five consecutive digits in the 10…

…00-digit number
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OpenGrid committed Aug 29, 2011
1 parent 9df1367 commit 8aab10633812a5c2ce8477747c7291cf71f8e1fd
Showing with 23 additions and 1 deletion.
  1. +23 −1 euler.js
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@@ -143,6 +143,27 @@ var Euler = (function() {
// http://primes.utm.edu/howmany.shtml
return primes(N * (Math.log(N) + Math.log(Math.log(N-1))))[N-1];
}
+ },
+ 8: {
+ 'link': 'http://projecteuler.net/index.php?section=problems&id=8',
+ 'desc': "Find the greatest product of five consecutive digits in the 1000-digit number",
+ solve: function() {
+ var n = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";
+ var digits = 0, product = 0, max = 0;
+ for(var d = 0; d < n.length; d++) {
+ if(n[d] == '0') {
+ digits = product = 0; continue;
+ }
+ product = (product === 0)? n[d] : product * n[d];
+ digits++;
+ if(5 === digits) {
+ max = (product > max)? product : max;
+ product = product / n[d-digits+1];
+ digits--;
+ }
+ }
+ return max;
+ }
}
};
return {
@@ -159,4 +180,5 @@ var Euler = (function() {
//console.log(Euler.result(4));
//console.log(Euler.result(5));
//console.log(Euler.result(6));
-console.log(Euler.result(7));
+//console.log(Euler.result(7));
+console.log(Euler.result(8));

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