class Solution { public int[] solution(int[] num_list) { int len = num_list.length+1; int[] answer = Arrays.copyOf(num_list, len); System.arraycopy(num_list, 0, answer, 0, num_list.length); if(num_list[num_list.length-1] > num_list[num_list.length-2]) { answer[answer.length-1] = num_list[num_list.length-1] - num_list[num_list.length-2]; } else { answer[answer.length-1] = num_list[num_list.length..

class Solution { public int[] solution(int[] arr) { int[] answer = new int [arr.length]; int idx = 0; for(int i = 0 ; i = 50 && arr[i] % 2 == 0) { answer[idx] += arr[i] / 2; } else if (arr[i] < 50 && arr[i] % 2 == 1) { answer[idx] += arr[i] * 2; } else { answer[idx] += arr[i]; } idx++; } return answer; } }

class Solution { public int solution(int[] num_list) { int answer = -1; for(int i = 0; i < num_list.length; i++) { if(num_list[i] < 0) { answer = i; break; } } return answer; } }

class Solution { public String solution(String my_string, String alp) { return my_string.replace(alp, alp.toUpperCase()); } }

class Solution { public int solution(String str1, String str2) { int answer = 0; if(str2.contains(str1)) { answer = 1; } return answer; } }