Chingari Interview Questions and Answers

Reverse a given Linked List with O(1) and O(N) space complexity.

• For O(1) space complexity, use three pointers to reverse the links in place.

• For O(N) space complexity, use a stack to store the nodes and then pop them to create the reversed list.

• Be careful with edge cases such as empty list or list with only one node.

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Merge Sort and Quick Sort are sorting algorithms that use divide and conquer approach.

• Merge Sort divides the array into two halves, sorts them recursively, and then merges them.

• Quick Sort selects a pivot element, partitions the array around the pivot, and recursively sorts the sub-arrays.

• Merge Sort has a worst-case time complexity of O(nlogn), while Quick Sort has an average case time complexity of O(nlogn).

• Merge Sort ...read more

Compute amount of water trapped in an elevation map after raining

• Iterate through the array and find the maximum height on the left and right of each bar

• Calculate the amount of water that can be trapped on each bar using the difference between the minimum of the two maximum heights and the height of the bar

• Add up the amount of water trapped on each bar to get the total amount of water trapped

Zigzag traversal of a binary tree is a way of traversing the tree in a zigzag pattern.

• Use a stack to keep track of nodes to be visited.

• For each level, alternate between adding nodes to the stack from left to right and right to left.

• Pop nodes from the stack and add their children to the stack in the appropriate order.

• Repeat until all nodes have been visited.

Sort a dictionary by key or value in ascending/descending order.

• Use sorted() function with lambda function to sort by key or value.

• For ascending order, use reverse=False and for descending order, use reverse=True.

• Example: sorted_dict = sorted(dictionary.items(), key=lambda x: x[0], reverse=True)