题解 | #字符串加密#

let originKey = readline()
let originStr = readline()

let middleKey = ''
let targetStr = ''
let obj = {}
let letters = new Array(26).fill(0)
for(let i = 0; i < originKey.length; i++) {
    let key = originKey[i]
    if(!obj[key]) {
        obj[key] = 1
        middleKey += key
        letters[key.codePointAt() - 'a'.codePointAt()] = 1
    }
}
for(let i = 0; i < 26; i++) {
    if(letters[i] === 0) {
        middleKey += String.fromCodePoint(i + 'a'.codePointAt())
    }
}
for(let i = 0; i < originStr.length; i++) {
    let key = originStr[i]
    targetStr += middleKey[key.codePointAt() - 'a'.codePointAt()]
}
console.log(targetStr)