Sandbox::https://github.com/sibalonecoding-code/JavaScript/blob/master/String/ScrambleStrings.js

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// Problem Statement and Explanation: https://leetcode.com/problems/scramble-string/

/**

* Given two strings s1 and s2 of the same length, return true if s2 is a scrambled string of s1, otherwise, return false.

* @param {string} s1

* @param {string} s2

* @return {boolean}

const isScramble = (s1, s2) => {

return helper({}, s1, s2)

}

const helper = function (dp, s1, s2) {

const map = {}

if (dp[s1 + s2] !== undefined) return dp[s1 + s2]

if (s1 === s2) return true

for (let j = 0; j < s1.length; j++) {

if (map[s1[j]] === undefined) map[s1[j]] = 0

if (map[s2[j]] === undefined) map[s2[j]] = 0

map[s1[j]]++

map[s2[j]]--

}

for (const key in map) {

if (map[key] !== 0) {

dp[s1 + s2] = false

return false

}

for (let i = 1; i < s1.length; i++) {

if (

(helper(dp, s1.substr(0, i), s2.substr(0, i)) &&

helper(dp, s1.substr(i), s2.substr(i))) ||

(helper(dp, s1.substr(0, i), s2.substr(s2.length - i)) &&

helper(dp, s1.substr(i), s2.substr(0, s2.length - i)))

) {

dp[s1 + s2] = true

return true

}

dp[s1 + s2] = false

return false

}

export { isScramble }