Reverse a linked list
1) Iterative Approach
2) Recursive Approach
2) Recursive Approach
Array : Element appears once in sorted array
Find the element that appears once in a sorted array where all other elements appear twice one after another. Find that element in 0(logn) complexity. Input: arr[] = {1, 1, 3, 3, 4, 5, 5, 7, 7, 8, 8} Output: 4 Solution : Test Cases: 1) {} 2) {1,1,5,7,7} 3) {1,1,2,2,7} 4) {2,3,3,5,5,7,7}
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