코딩아 재윤해

import java.util.*; class Solution { public int solution(String s) { int answer = 0; Stack stack = new Stack(); for (String word : s.split(" ")) { if (word.equals("Z")) { stack.pop(); } else { stack.push(Integer.parseInt(word)); } } for (int i : stack) { answer += i; } return answer; } }

import java.util.*; class Solution { public int[] solution(int n) { List list = new ArrayList(); int num = n; for (int i = 2; i i).toArray(); } }

class Solution { public String solution(String s) { String answer = ""; int[] arr = new int[26]; for (int i = 0; i < 26; i++) { arr[i] = 0; } for (int i = 0; i < s.length(); i++) { arr[s.charAt(i) - 97] += 1; } for (int i = 0; i < 26; i++) { if (arr[i] == 1) { answer += (char)(i + 97); } } return answer; } }

class Solution { public int solution(int[] array) { int count = 0; for (int i = 0; i < array.length; i++) { String num = Integer.toString(array[i]); String[] arr = num.split(""); for (String j : arr) { if (j.equals("7")) count++; } } return count; } }

class Solution { public int solution(int[] numbers, int k) { return numbers[(2 * (k - 1)) % numbers.length]; } }

class Solution { public int solution(int balls, int share) { return combination(balls, share); } public int combination(int A, int B) { if (A == B || B == 0) return 1; return combination(A - 1, B) + combination(A - 1, B - 1); } }

이건 내가 작성한 코드 class Solution { public int solution(String A, String B) { String comp = A; int count = 0; for (int i = 0; i < A.length(); i++) { if (comp.equals(B)) { return count; } String last = comp.substring(A.length() - 1); comp = last + comp.substring(0, A.length() - 1); count++; } return -1; } } 이거 문제 풀고나면 다른 사람 풀이도 볼 수 있는데 진짜 대단한 사람이 많다는 것을 매번 느낌.. 이게 다른 사람 풀이 class Solution { public int s..

class Solution { public int solution(int n) { int count = 0; for (int i = 4; i

import java.util.stream.*; class Solution { public int solution(int order) { int answer = 0; int[] digits = Stream.of(String.valueOf(order).split("")) .mapToInt(Integer::parseInt) .toArray(); for (int i = 0; i < digits.length; i++) { if (digits[i] % 3 == 0 && digits[i] != 0) answer++; } return answer; } }

import java.util.Arrays; import java.util.Collections; import java.util.List; import java.util.stream.Collectors; class Solution { public String solution(String myString, int num1, int num2) { List list = Arrays.stream(myString.split("")).collect(Collectors.toList()); Collections.swap(list, num1, num2); return String.join("", list); } }