10+ Geeco Enercon Interview Questions and Answers

Reverse a given string containing alphabets, numbers, and special characters.

• Iterate through the string from the end to the beginning and append each character to a new string.

• Use built-in functions like reverse() or slicing to reverse the string.

• Handle special characters and numbers while reversing the string.

• Ensure to consider the constraints on the input string length and number of test cases.

Determine if one string can be transformed into another by performing at most one operation (insert, delete, replace).

• Iterate through both strings simultaneously and check for differences.

• Handle cases where a character needs to be inserted, deleted, or replaced.

• Keep track of the number of operations performed and ensure it does not exceed one.

Remove duplicate occurrences of characters in a given string.

• Use a hash set to keep track of characters seen so far.

• Iterate through the string and add non-duplicate characters to a new string.

• Return the new string without duplicate characters.

Dijkstra's algorithm is used to find the shortest path from a source node to all other nodes in a graph with weighted edges.

• Implement Dijkstra's algorithm to find the shortest path distances from the source node to all other nodes.

• Use a priority queue to efficiently select the next node with the shortest distance.

• Update the distances of neighboring nodes based on the current node's distance and edge weights.

• Handle disconnected vertices by assigning a large value (e.g., 214748...read more

Stack is used for static memory allocation and stores local variables, while Heap is used for dynamic memory allocation and stores objects.

• Stack is faster than Heap as it has a fixed size and memory allocation is done at compile time.

• Heap is slower than Stack as memory allocation is done at runtime and requires more complex management.

• Stack memory is limited and typically smaller in size, while Heap memory is larger and can grow as needed.

• Objects in OOP are typically stored i...read more

To measure exactly 15 minutes using two hourglasses of 7 and 11 minutes, start both hourglasses together and then flip the 7-minute hourglass when it runs out.

• Start both hourglasses at the same time.

• When the 7-minute hourglass runs out, flip it immediately.

• When the 11-minute hourglass runs out, 4 minutes will have passed on the 7-minute hourglass. This gives a total of 15 minutes.

Query to find the nth highest salary from a database

• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to select the nth highest salary

• Consider handling cases where there may be ties for the nth highest salary

malloc is a function in C for dynamic memory allocation, while new is an operator in C++ for dynamic memory allocation and object creation.

• malloc is a function in C, while new is an operator in C++.

• malloc returns a void pointer, while new returns a pointer to the type being allocated.

• malloc does not call constructors, while new calls constructors for object initialization.

• malloc requires manual memory deallocation with free, while new automatically calls the destructor and de...read more

C is a procedural programming language while C++ is an object-oriented programming language with features like classes and inheritance.

• C is a procedural programming language, while C++ is a multi-paradigm language with support for object-oriented programming.

• C does not support classes and objects, while C++ does.

• C does not have features like inheritance and polymorphism, which are present in C++.

• C is a subset of C++, meaning that C++ includes all of C's features and adds new ...read more