저장을 습관화
프로그래머스 LV.0 두 수의 합 본문
프로그래머스 LV.0 두 수의 합
https://school.programmers.co.kr/learn/courses/30/lessons/181846
프로그래머스
코드 중심의 개발자 채용. 스택 기반의 포지션 매칭. 프로그래머스의 개발자 맞춤형 프로필을 등록하고, 나와 기술 궁합이 잘 맞는 기업들을 매칭 받으세요.
programmers.co.kr
1. 문제 명
두 수의 합
2. 문제 설명
0 이상의 두 정수가 문자열 a, b로 주어질 때, a + b의 값을 문자열로 return 하는 solution 함수를 작성해 주세요.
3. 제한 사항
- 1 ≤ a의 길이 ≤ 100,000
- 1 ≤ b의 길이 ≤ 100,000
- a와 b는 숫자로만 이루어져 있습니다.
- a와 b는 정수 0이 아니라면 0으로 시작하지 않습니다.
4. 예시
| a | b | result |
| "582" | "734" | "1316" |
| "18446744073709551615" | "287346502836570928366" | "305793246910280479981" |
| "0" | "0" | "0" |
5. 기본 제공 코드
function solution(a, b) {
var answer = '';
return answer;
}//
6. 제출한 내 답
const solution = (a, b) => {
return BigInt(a) + BigInt(b) + "";
};
6-2. VSC에 작성한 내용
const solution = (a, b) => {
return BigInt(a) + BigInt(b) + "";
};
// 테스트
console.log(solution("582", "734"));
console.log(solution("18446744073709551615", "287346502836570928366"));
console.log(solution("0", "0"));
7. 특이사항
단순 덧셈 문제가 왜 지금 나오지? 라고 생각했는데 단순 덧셈이 아니었다
평소대로 문자열 매개변수 두 수를 더하는 함수를 작성했는데 에러가 나서 다시 보니
const solution = (a, b) => {
return String(+a + +b);
};'절대값이 2의 53승, 9007199254740992보다 큰 숫자 리터럴은 너무 커서 정수로 정확하게 표시할 수 없습니다'
라는 메세지가 나왔다.
자바스크립트의 숫자 범위는 2의 52승까지 지원하기 때문에
18446744073709551615는 18446744073709552000로,
287346502836570928366는 287346502836570900000로 남은 값은 드랍되는 상황이 발생한다
제한사항도 다시 읽어보니 a와 b의 값이 1 이상 10만 이하인게 아닌
a와 b의 '길이'가 1이상 10만 이하였다..
길이가 10만인 수는 얼마나 큰지 궁금해서 적어보니 아래와 같았다.
console.log(
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0"
.length
); // 100000
...
문제를 풀기위해서 여러 방법을 써봤었다
작성 가능한 숫자가 2^52승이고, 이는 길이가 15이니 splice(i, 15)로 15자리씩 잘라가며 배열에 넣은뒤
reduce를 하려했으나 이는 단위가 달라지기 때문에 잘못된 방법이었고
함수를 작성하여 매개변수에서 2^52승씩 빼가며 배열에 넣은뒤 전부 더하는 방법이나,
2진수, 16진수로 바꾸어 모두 더한후 다시 10진수로 바꾸는 방법도 해보았으나
결국엔 어쨌든 String((계산식))에서 계산식이 2^53 이상이면 잘못된 숫자가 문자열로 바뀌어 출력되었다
다른 방법을 찾기위해 2^53 이상의 수도 표현할 수 있는 방법을 검색해보았고
bigint 유형이라는 것을 알게 되었다.
큰 수의 끝에 n을 붙여주기만 하면 되며, 아래와 같이 표시된다.
console.log(18446744073709551615); // 18446744073709552000
console.log(287346502836570928366); // 287346502836570900000
console.log(18446744073709551615n); // 18446744073709551615n
console.log(287346502836570928366n); // 287346502836570928366n
console.log(18446744073709551615n + 287346502836570928366n); // 305793246910280479981n
console.log(String(305793246910280479981)); // 305793246910280500000
console.log(String(305793246910280479981n)); // 305793246910280479981
8. 다른 사람이 작성한 답
8-1. 실력으로 푸신 분
function solution(a, b) {
a = [...a];
b = [...b];
let answer = [];
let next = 0;
while(a.length && b.length) {
let _a = +a.pop();
let _b = +b.pop();
let sum = _a + _b + next;
if(sum >= 10) {
sum -= 10;
next = 1;
} else
next = 0;
answer.push(sum);
}
let rest = a.length ? a : b;
while(rest.length) {
let sum = +rest.pop() + next;
if(sum >= 10) {
sum -= 10;
next = 1;
} else
next = 0;
answer.push(sum);
}
if(next)
answer.push(next);
return answer.reverse().join("");
}대단하시다..
8-2.
나머지 사람들은 대부분 BigInt 사용함
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