ER-Diagram to Relational Database Design
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October 17, 2024
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Entity Sets to Tables An entity set is converted into a relation by mapping each attribute of the set to an attribute of...
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Create, Update, and Delete Documents in MongoDB
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October 16, 2024
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Inserting and Saving Documents Inserts are the basic method for adding data to MongoDB. To insert a document into a collection...
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Querying in MongoDB
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October 15, 2024
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The find method is utilized to execute queries in MongoDB. Querying yields a subset of documents within a collection, ranging from none ...
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Given an image represented by an NxN matrix, where each pixel in the image is 4 bytes, write a method to rotate the image by 90 degrees.
BunksAllowed
October 15, 2024
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The rotation can be performed in layers, where you perform a cyclic swap on the edges on each layer. In the first for loop, we rotate th...
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Write a method to decide if two strings are anagrams or not
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October 15, 2024
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Check if the two strings have identical counts for each unique char. public static boolean anagram(String s, String t) { if (...
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Design an algorithm and write code to remove the duplicate characters in a string without using any additional buffer.
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October 15, 2024
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public static void removeDuplicates(char[] str) { if (str == null) return; int len = str.length; if (len < 2) return; int...
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Implement an algorithm to determine if a string has all unique characters. What if you can not use additional data structures?
BunksAllowed
October 15, 2024
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For simplicity, assume char set is ASCII (if not, we need to increase the storage size. The rest of the logic would be the same). NOTE: ...
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Write a method to randomly generate a set of m integers from an array of size n. Each element must have equal probability of being chosen.
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October 14, 2024
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Our first instinct on this problem might be to randomly pick elements from the array and put them into our new subset array. But then, w...
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Write a method to shuffle a deck of cards
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October 14, 2024
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It must be a perfect shuffle - in other words, each 52! permutations of the deck has to be equally likely. Assume that you are given a r...
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Write a function that adds two numbers. You should not use + or any arithmetic operators
BunksAllowed
October 14, 2024
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int add_no_arithm(int a, int b) { if (b == 0) return a; int sum = a ^ b; // add without carrying int carry = (a & b) << ...
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Machine Learning Technique -> Naive Bayes
BunksAllowed
October 14, 2024
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In the context of spam filtering the actual text of the e-mail x corresponds to the test and the label y is equivalent to the diagnos...
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