To solve a problem in which, given, we are tasked to find the number such that the XOR sum of a given array with that number becomes equal to k, for example.Input: arr[] = {1, 2, 3, 4, 5}, k = 10 Output: 11 Explanation: 1 ^ 2 ^ 3 ^ 4 ^ 5 ^ 11 = 10 Input: arr[] = { 12, 23, 34, 56, 78 }, k = 6 Output: 73In this program, we are going to use the property of xor if A^B = C and A^C = B, and we are going to apply this ... Read More

To solve a problem in which we are given an array and some queries. Now in each query, we are given a range. Now we need to find a number such that the sum of their xor with x is maximized, for exampleInput : A = {20, 11, 18, 2, 13} Three queries as (L, R) pairs 1 3 3 5 2 4 Output : 2147483629 2147483645 2147483645In this problem, we are going to take a prefix count of 1’s present in the numbers at each position now as we have precalculated our number of ones, so for finding the ... Read More

Given an N-ary tree and we are tasked to find the total number of ways to traverse this tree, for example −For the above tree, our output will be 192.For this problem, we need to have some knowledge about combinatorics. Now in this problem, we simply need to check all the possible combinations for every path and that will give us our answer.Approach to Find the SolutionIn this approach, we simply need to perform a level order traversal and check the number of children each node has and then simply multiply its factorial to the answer.ExampleC++ Code for the Above ... Read More

To solve a problem in which n − the number of people now each person can either be single or be present in a pair, so we need to find the total number of ways these people can be paired up.Input : 3 Output: 4 Explanation : [ {1}, {2}, {3}, ], [{1, 2}, {3}], [{1}, {2, 3}], [{1, 3}, {2}] these four ways are the only ways we can pa up these 3 people. Input : 6 Output : 76Approach to Find the SolutionIn this approach, we are going to use the formula of Young ... Read More

To solve a problem in which we are given an array containing the size of the boxes. Now we are given a condition that we can fit a smaller box inside a bigger box if the bigger box is at least twice the size of the smaller box. Now we must determine how many visible boxes there are, for example.Input : arr[] = { 1, 3, 4, 5 } Output : 3 Put a box of size 1 in the box of size 3. Input : arr[] = { 4, 2, 1, 8 } Output : 1Approach to Find ... Read More

Subarrays are the contiguous part of an array. For example, we consider an array [5, 6, 7, 8], then there are ten non-empty subarrays like (5), (6), (7), (8), (5, 6), (6, 7), (7, 8), (5, 6, 7), (6, 7, 8) and (5, 6, 7, 8).In this guide, we will explain every possible information to find the number of subarrays with odd sums in C++. For finding the number of subarrays with the odd sum, we can use different approaches, so here is a simple example for it −Input : array = {9, 8, 7, 6, 5} Output : 9 ... Read More

In this article, we will solve the number of subarrays having sum in a given range using the C++ program. We have an array arr[] of positive integers, and a range {L, R} and we have to calculate the total number of subarrays having sum in the given range form L to R. So here is the simple example for the problem −Input : arr[] = {1, 4, 6}, L = 3, R = 8 Output : 3 The subarrays are {1, 4}, {4}, {6}. Input : arr[] = {2, 3, 5, 8}, L = 4, ... Read More

If you have ever used C ++, you must know what subarrays are and how useful they are. As we know that, in C++, we can solve multiple mathematical problems easily. So in this article, we will explain the complete information on how we can find M odd numbers with the help of these subarrays in C++.In this problem, we need to find many subarrays formed with the given array and integer m where each subarray contains exactly m odd numbers. So here is the simple example of this approach −Input : array = { 6, 3, 5, 8, 9 ... Read More

In this article, we will solve the problem of finding the number of subarrays whose maximum and minimum elements are the same using C++. Here is the example for the problem −Input : array = { 2, 3, 6, 6, 2, 4, 4, 4 } Output : 12 Explanation : {2}, {3}, {6}, {6}, {2}, {4}, {4}, {4}, {6, 6}, {4, 4}, {4, 4} and { 4, 4, 4 } are the subarrays which can be formed with maximum and minimum element same. Input : array = { 3, 3, 1, 5, 1, 2, 2 } Output : 9 ... Read More

In this article, we will explain everything about solving the number of subarrays having the sum of the form k^m, m >= 0 in C++. Given an array arr[] and an integer K, we need to find the number of subarrays having sum in the form of K^m where m is greater than equal to zero, or we can say we need to find the number of subarrays having sum equal to some non-negative power of K.Input: arr[] = { 2, 2, 2, 2 } K = 2 Output: 8 Sub-arrays with below indexes are valid: [1, 1], ... Read More