In the given problem, we are given a string consisting of 0’s and 1’s; we are required to find the total number of permutations such that the string starts with 1’s. As the answer can be a vast number, so we print as a mod with 1000000007.Input : str ="10101001001" ... Read More

We require the appropriate knowledge to create several unique pairs in an array syntax in C++. In finding the number of unique pairs, we count all unique pairs in a given array, i.e., all possible pairs can be formed where each pair should be unique. For example −Input : array[ ... Read More

We are given several points present in 3 lines now; we are required to find how many triangles these points can form, for exampleInput: m = 3, n = 4, k = 5 Output: 205 Input: m = 2, n = 2, k = 1 Output: 10We will apply ... Read More

n the article, first, we have to draw a colored triangle. We need to take an uncolored triangle and divide the triangle into four small equilaterals. Triangles with the same area and keep doing it till the nth step and find the number of equilateral triangles present in the figure.Approach ... Read More

In this article, we will understand the problem of finding trailing zeros of a given number N in the base B representation of its factorial. For examplesInput : N = 7 Base = 2 Output : 4 Explanation : fact(7) = 5040 in base10 and 1001110110000 in base16 having 4 ... Read More

In this article, we will understand the problem of finding trailing zeros of a given number N in the base 16 representation of its factorial for exampleInput : N = 7 Output : 1 Explanation : fact(7) = 5040 in base10 and 13B0 in base16 having 1 trailing zero. ... Read More

In this article, we are given two strings, and we need to find out how many substrings of the 1st string can be found in the 2nd string(the exact substring can occur multiple times). For exampleInput : string1 = “fogl”    string2 = “google” Output : 6 Explanation : substrings ... Read More

In this article, you will learn about the approaches to find the number of substrings (non-empty) that you can form in a given string.Input : string = “moon” Output : 10 Explanation: Substrings are ‘m’, ‘o’, ‘o’, ‘n’, ‘mo’, ‘oo’, ‘on’, ‘moo’, ‘oon’ and ‘moon’. Input : string = ... Read More

To find the probability of numbers’ parity, i.e., is it even or odd, and for the given ranges. For each query, we need to print p and q representing the probability by p / q, for example.Input : N = 5, arr[] = { 6, 5, 2, 1, 7 } ... Read More

In this problem we are given a binary tree and we are required to perform dfs from a particular node in which we assume the given node as the root and perform dfs from it.In the above tree suppose we are required to perform DFS from node FIn this tutorial ... Read More