2021.02.02 연습

 

  • 사용언어 : java

 


class Solution {
    public int[] decode(int[] encoded, int first) {
        
        int[] result = new int[encoded.length+1];
        result[0] = first;
        
        for (int i = 0; i <result.length-1; i++) {
            result[i+1] = encoded[i] ^ result[i];
        }
        
        return result;
    }
}
  • XOR 연산 : 입력값 중 하나만 true일 때 true를 리턴해준다.

 

Runtime: 1 ms, faster than 100.00% of Java online submissions for Decode XORed Array. Memory Usage: 39.6 MB, less than 92.63% of Java online submissions for Decode XORed Array.

 


class Solution {
    public boolean arrayStringsAreEqual(String[] word1, String[] word2) {
        
        StringBuilder w1 = new StringBuilder();
        StringBuilder w2 = new StringBuilder();
        
        for (String s1 : word1) {
            w1.append(s1);
        }
        
        for (String s2 : word2) {
            w2.append(s2);
        }
        
        return (w1.toString()).equals(w2.toString());
        
        
    }
}

Runtime: 1 ms, faster than 73.59% of Java online submissions for Check If Two String Arrays are Equivalent. Memory Usage: 38.7 MB, less than 23.14% of Java online submissions for Check If Two String Arrays are Equivalent.