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ConvertBinaryNumberinaLinkedListtoInteger_1290.cpp
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/*
~ Author : https://leetcode.com/tridib_2003/
~ Problem : 1290. Convert Binary Number in a Linked List to Integer
~ Link : https://leetcode.com/problems/convert-binary-number-in-a-linked-list-to-integer/
*/
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode() : val(0), next(nullptr) {}
* ListNode(int x) : val(x), next(nullptr) {}
* ListNode(int x, ListNode *next) : val(x), next(next) {}
* };
*/
class Solution {
public:
// Approach 1
int getDecimalValue(ListNode* head) {
int result = head -> val;
while (head -> next != NULL) {
result = (result << 1) | head -> next -> val;
head = head -> next;
}
return result;
}
// Approach 2.1
/*
int getDecimalValue(ListNode* head) {
int result = head -> val;
while (head -> next != NULL) {
result = result * 2 + head -> next -> val;
head = head -> next;
}
return result;
}
*/
// Approach 2.2
/*
int getDecimalValue(ListNode* head) {
int result = 0;
while (head != NULL) {
result = result * 2 + head -> val;
head = head -> next;
}
return result;
}
*/
};
// T.C. - O(N)
// S.C. - O(1)