freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-9-special-pythagorean-triplet.english.md

id, challengeType, title

id	challengeType	title
5900f3761000cf542c50fe88	5	Problem 9: Special Pythagorean triplet

Description

A Pythagorean triplet is a set of three natural numbers, a < b < c, for which,

a² + b² = c²

For example, 3² + 4² = 9 + 16 = 25 = 5². There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product abc such that a + b + c = n.

Instructions

Tests

tests:
  - text: <code>specialPythagoreanTriplet(1000)</code> should return 31875000.
    testString: assert.strictEqual(specialPythagoreanTriplet(1000), 31875000, '<code>specialPythagoreanTriplet(1000)</code> should return 31875000.');
  - text: <code>specialPythagoreanTriplet(24)</code> should return 480.
    testString: assert.strictEqual(specialPythagoreanTriplet(24), 480, '<code>specialPythagoreanTriplet(24)</code> should return 480.');
  - text: <code>specialPythagoreanTriplet(120)</code> should return 49920.
    testString: assert.strictEqual(specialPythagoreanTriplet(120), 49920, '<code>specialPythagoreanTriplet(120)</code> should return 49920.');

Challenge Seed

function specialPythagoreanTriplet(n) {
 let sumOfabc = n;
 // Good luck!
 return true;
}

specialPythagoreanTriplet(1000);

Solution

const specialPythagoreanTriplet = (n)=>{
 let sumOfabc = n;
 let a,b,c;
 for(a = 1; a<=sumOfabc/3; a++){
 for(b = a+1; b<=sumOfabc/2; b++){
 c = Math.sqrt(a*a+b*b);
 if((a+b+c) == sumOfabc){
 return a*b*c;
 }
 }
 }
}