Added Sequence-Equation problem solution

Author: ParrotStone

Sequence Equation/main.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+// Problem Description at -> https://www.hackerrank.com/challenges/permutation-equation/problem
+
+function permutationEquation(p) {
+ const output = [];
+ for (let i = 1; i <= p.length; i++) {
+ const p_x = p.indexOf(i) + 1;
+ output.push(p.indexOf(p_x) + 1);
+ }
+
+ return output;
+}
+
+console.log(permutationEquation([2, 3, 1])); // 2, 3, 1
+// console.log(permutationEquation([4, 3, 5, 1, 2])); // 1, 3, 5, 4, 2