2021.03.01 연습

 

  • 사용언어 : java

 


/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public int getDecimalValue(ListNode head) {
        
        StringBuilder sb = new StringBuilder();
        
        while (head != null) {
            sb.append(head.val);
            head = head.next;
        }
        
        return Integer.parseInt(sb.toString(), 2);
    }
}

Runtime: 0 ms, faster than 100.00% of Java online submissions for Convert Binary Number in a Linked List to Integer. Memory Usage: 36.4 MB, less than 60.14% of Java online submissions for Convert Binary Number in a Linked List to Integer.

 

  • 다른 코드 참고

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public int getDecimalValue(ListNode head) {
        
        int val = 0;
        
        while (head != null) {
            val = (val << 1) + (head.val);
            head = head.next;
        }
        
        return val;
    }
}