NxtWave Interview Questions and Answers

Given an arithmetic expression, place parentheses to maximize the value of the expression.

• Identify the operators in the expression ('+', '-', '*').

• Consider the precedence of operators to determine where to place parentheses.

• Calculate the value of the expression with different placements of parentheses to find the maximum value.

The task is to find the Kth largest element from a given list of numbers for each test case.

• Read the number of test cases 'T'

• For each test case, read the number of elements 'N' and the Kth largest number to find 'K'

• Sort the array in descending order and output the Kth element

The task is to determine the weight of the minimum spanning tree of a given connected undirected weighted graph.

• Implement Kruskal's algorithm to find the minimum spanning tree weight.

• Sort the edges based on their weights in non-decreasing order.

• Iterate through the sorted edges and add them to the MST if they don't form a cycle.

• Keep track of the total weight of the MST and return it as the output.

Generate a numeric pattern based on the given input integer N specifying the number of rows.

• Iterate from 1 to N to print each row

• Start each row with the row index and increase consecutively per row count

• Use nested loops to handle the increasing numbers in each row

Convert a binary tree into a sum tree by replacing each node's value with the sum of its children's values. Return the preorder traversal of the sum tree.

• Traverse the tree in a bottom-up manner to calculate the sum of children for each node.

• Set leaf nodes to 0 and update non-leaf nodes with the sum of their children.

• Return the preorder traversal of the modified tree.