LeetCode-1290. Convert Binary Number in a Linked List to Integer

LeetCode-1290. Convert Binary Number in a Linked List to Integer

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: 5Explanation: (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​​0​​​ or​​1​​.

题解：

class Solution {public: int getDecimalValue(ListNode* head) { int res = 0; while (head != NULL) { res = res * 2 + head->val; head = head->next; } return res; }};

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