Convert Binary Number in a Linked List to Integer (E)
題目
Given head which is a reference node to a singly-linked list. The value of each node in the linked list is either 0 or 1. The linked list holds the binary representation of a number.
Return the decimal value of the number in the linked list.
Example 1:
Input: head = [1,0,1]
Output: 5
Explanation: (101) in base 2 = (5) in base 10
Example 2:
Input: head = [0]
Output: 0
Example 3:
Input: head = [1]
Output: 1
Example 4:
Input: head = [1,0,0,1,0,0,1,1,1,0,0,0,0,0,0]
Output: 18880
Example 5:
Input: head = [0,0]
Output: 0
Constraints:
- The Linked List is not empty.
- Number of nodes will not exceed
30. - Each node's value is either
0or1.
題意
給定一個用來表示二進制數的鏈表，要求求出這個數，
思路
和求十進制一樣，
代碼實作
Java
class Solution {
public int getDecimalValue(ListNode head) {
int num = 0;
while (head != null) {
num = num * 2 + head.val;
head = head.next;
}
return num;
}
}
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