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Which data structure is used in redo-undo feature?

Explanation:  Stack data structure is most suitable to implement redo-undo feature. This is because the stack is implemented with LIFO(last in first out) order which is equivalent to redo-undo feature i.e. the last re-do is undo first. Consider a situation where a client receives packets from a server. There may be differences in speed of the client and the server. Which data structure is best suited for synchronization? (A)  Circular Linked List (B)  Queue (C)  Stack (D)  Priority Queue Answer:   (B) Explanation:  Since packets need to be processed in First In First Out order, a queue can be used for synchronization. A data structure is required for storing a set of integers such that each of the following operations can be done in (log n) time, where n is the number of elements in the set. o Delection of the smallest element o Insertion of an element if it is not already present in the set Which of the following data structur...
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Typical Programs in C/C++

  Sum of two large numbers Difficulty Level :   Medium   Last Updated :  04 Jun, 2019 Given two numbers as strings. The numbers may be very large (may not fit in long long int), the task is to find sum of these two numbers. Examples: Input : str1 = "3333311111111111", str2 = "44422222221111" Output : 3377733333332222 Input : str1 = "7777555511111111", str2 = "3332222221111" Output : 7780887733332222 The idea is based on school mathematics. We traverse both strings from end, one by one add digits and keep track of carry. To simplify the process, we do following: 1) Reverse both strings. 2) Keep adding digits one by one from 0’th index (in reversed strings) to end of smaller string, append the sum % 10 to end of result and keep track of carry as sum/10. 3) Finally reverse the result. // C++ program to find sum of two large numbers. #include<bits/stdc++.h> using namespace std;     // Function for finding sum of la...
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Find the most frequent digit without using array/string

Find the most frequent digit without using array/string Last Updated: 20-11-2018 Given an integer, find the most occurring digit in it. If two or more digits occur same number of times, then return the highest of them. Input integer is given as an int variable, not as a string or array. Use of hash or array or string is not allowed. Example: Input: x = 12234 Output: The most frequent digit is 2 Input: x = 1223377 Output: The most frequent digit is 7 Input: x = 5 Output: The most frequent digit is 5 Input: x = 1000 Output: The most frequent digit is 0 We could create a map of size 10 and store count of all digits, but use of any array/string is not allowed. The idea is simple, we write a function that counts occurrences of a given digit in a given integer. Then we count all digits from 0 to 9 in given integer. We keep updating maximum count whenever count becomes more or same as previous count. Below is the implementation. // Finds maximum occurring digit without using any array/...
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