In this article, we are given a question in which we need to find the total number of ways from point A to B where A and B are fixed points, i.e., A is the top-left point in the grid and B is the bottom right point in the grid for example −Input : N = 5 Output : 252 Input : N = 4 Output : 70 Input : N = 3 Output : 20In the given problem, we can formalize the answer by simple observations and get our results.Approach to find The SolutionIn this approach, we ... Read More

In this article, we will discuss counting the number of unique triplets (x, y, z) in a given array of unique numbers where their XOR is 0. Thus, triplets should be unique where all the three elements are unique and would count all the combinations of triplets for example −Input : arr[ ] = { 5, 6, 7, 1, 3 } Output : 2 Explanation : triplets are { 5, 6, 3 } and { 6, 7, 1 } whose XOR is zero. Input : arr[ ] = { 3, 6, 8, 1, 5, 4 , 12} Output : ... Read More

Discuss how to remove an entry from HashMap using the value while iterating over it, for exampleInput: HashMap: { 1: “ Mango ”, 2: “ Orange ”, 3: “ Banana ”, 4: “Apple ” }, value=”Banana” Output: HashMap: { 1: “ Mango ”, 2: “ Orange ”, 4: “Apple ” }. Explanation: The third key-value pair is removed using the value “banana”. Input: HashMap: { 1: “Yellow”, 2: “White”, 3: “Green” }, value=”White” Output: HashMap: { 1: “Yellow”, 3: “Green” }.Approach to Find the SolutionIn C++, We can remove the element using the .erase() function. From ... Read More

This tutorial will discuss how to remove an entry from HashMap using the key while traversing through it. for example, Input: HashMap: { 1: “Tutorials”,                   2: “Tutorials”,                   3: “Point” }, key=1 Output: HashMap: { 2: “Tutorials”,                    3: “Point” }. Explanation: The first element is removed using key ‘1’. Input: HashMap: { 1: “God”, ... Read More

Discuss a problem to rearrange a string of alphabets in sorted order and add all the integers present in the string, for exampleInput : str = “adv4fc3” Output : “ acdfv7” Explanation: all the letters have been sorted to “acdfv” followed by the sum of integers 4 and 3. Input: str = “ h2d7e3f ” Output: “ defh12” Explanation: all the letters have been sorted to “defh” followed by the sum of integers 2, 7, and 3.Approach to Find the SolutionWe have two tasks to perform in this problem, one is sorting the string, and the other is adding ... Read More

Discuss a problem where we are given a ratio of sums of m and n terms of A.P. We need to find the ratio of mth and nth terms.Input: m = 8, n = 4 Output: 2.142 Input: m = 3, n = 2 Output: 1.666 Input: m = 7, n = 3 Output: 2.6Approach to Find the SolutionTo find the ratio of mth and nth terms using code, we need to simplify the formula. Let Sm be the sum of first m terms and Sn be the sum of the first n terms of the A.P.a - ... Read More

Given a n*n grid maze. Our rat is present in the top left corner of the grid. Now rats can only move down or forward, and if and only if the block has a non-zero value to it now in this variation rat is allowed to have multiple jumps. The maximum jump that the rat can take from the current cell is the number present in the cell, and now you are tasked to find if the rat can reach the bottom right corner of the grid, for example −Input : { { {1, 1, 1, 1}, {2, 0, 0, ... Read More

Sparsh Table is a data structure, which is used to give results of range queries. It provides the result of most range queries in O(logN) complexity. For maximum range queries, it can also compute the result in O(1).This tutorial will discuss the problem of a range sum query using a sparse table where we are given an array. We need to find the sum of all elements in range L and R, for example.Input: arr[ ] = { 2, 4, 1, 5, 6, 3 } query(1, 3), query(0, 2), query(1, 5). Output: 10 7 19 Input: arr[ ] ... Read More

Given an array and several queries. Also, there are two types of query, i.e., update[ L, R ] means update elements from L to R with their square roots, and query[ L, R ] means to calculate the sum of elements from L to R.We are assuming a 1-based indexed array, for exampleInput: nums[ ] = { 0, 9, 4, 1, 5, 2, 3 }, Query[ ] = { {1, 1, 3}, {2, 1, 2}, {1, 2, 5}, { 1, 4, 5}} Output: 14 10 7 1st element of 1st query is 1 means we need to calculate range sum ... Read More

Discuss a problem to answer queries to the given array. For each query index, we need to find the number of ones and zeros to the left of the index, for example.Input: arr[ ] = { 0, 1, 1, 1, 0, 0, 0, 1, 0, 0}, queries[ ] = { 2, 4, 1, 0, 5 } Output: query 1: zeros = 1, ones = 1 query 2: zeros = 1, ones = 3 query 3: zeros = 1, ones = 0 query 4: zeros = 0, ones = 0 query 5: zeros = 2, ones = 3 Input: arr[ ... Read More