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C++ Articles
Page 153 of 597
Program to find the Area and Perimeter of a Semicircle in C++
In this problem, we are given a value that denotes the radius of a semicircle. Our task is to create a program to find the Area and Perimeter of a Semicircle in C++.SemiCircle is a closed figure that is half of a circle.Let’s take an example to understand the problem, InputR = 5Outputarea = 39.25 perimeter = 15.7Solution ApproachTo solve the problem, we will use the mathematical formula for the area and perimeter of a semi-circle which is derived by dividing the area of circle by 2.Area of semicircle, A= $½(\prod^*a^2)=1.571^*a^2$Perimeter of semicircle, P =(π*a)Area of semicircle, area = $½(π^*a^2)$Program ...
Read MoreDecode Ways II in C++
Suppose there is a message, that is containing letters from A-Z is being encoded to numbers using the following mapping way −'A' -> 1, 'B' -> 2, ... , 'Z' -> 26Now, the encoded string can also contain the character '*', which can be treated as one of the numbers from 1 to 9. So if we have the encoded message containing digits and the character '*', then we have to find the total number of ways to decode it. If the answer is very long, we can use mod 109 + 7 to get the final result. So if ...
Read MoreStrange Printer in C++
Suppose there is a strange printer It has some requirements −The printer can print only a sequence of the same character each time.In each turn, the printer can print new characters starting from and ending at any places, and will cover the original existing characters.So if we have a string consists of lower letters, our task is to count the minimum number of turns the printer needed in order to print it.So if the input is like “aaabba”, then it will take 2 turns, first prints aaaaa then b’s by replacing the characters.To solve this, we will follow these steps ...
Read MoreProgram to find the Area and Volume of Icosahedron in C++
In this problem, we are given a value that denotes the side of an icosahedron. Our task is to create a program to find the Area and Volume of Icosahedron in C++.Icosahedron is a regular 30 sided polyhedron. It has 20 equilateral triangles of the same side. There are only 12 vertices of this polyhedron.Dashed lines are for the edges that are behind the visible surface.Let’s take an example to understand the problem, Inputa = 4Program to illustrate the working of our solution, Example#include using namespace std; float calcIcoSArea(float a) { return (8.660 * a * a); } ...
Read MoreKth Smallest Number in Multiplication Table in C++
Suppose we know about one Multiplication Table. But could we find out the k-th smallest number quickly from the multiplication table? So if we have to height m and the length n of a m * n Multiplication Table, and one positive integer k, we have need to find the k-th smallest number in this table.So if m = 3 and n = 3 and k is 6, then the output will be 4., this is because the multiplication table is like −1231123224633696th smallest element is 4 as [1, 2, 2, 3, 3, 4, 6, 6, 9]To solve this, we ...
Read MoreChalkboard XOR Game in C++
Suppose we have an array called nums, where nums[i] are written on a chalkboard. Ram and Sam take turns erasing exactly one element from the chalkboard, with Ram starting first. If erasing a number causes the bitwise XOR of all the elements of the chalkboard to become 0, then that player loses. Bitwise XOR of one element is that element itself, and the bitwise XOR of no elements is 0. If any player starts their turn with the bitwise XOR of all the elements of the chalkboard equal to 0, then that player will win. Suppose the array is holding ...
Read MoreRedundant Connection II in C++
Suppose we have a rooted tree. This is a directed graph such that, there is exactly one node (which is the root) for which all other nodes are descendants of this node, and every node has exactly one parent, except for the root node. Root has no parents.In the given input a directed graph that started as a rooted tree with N nodes (All values are unique), with one additional directed edge added. The added edge has two different vertices chosen from 1 to N, and was not an edge that already existed.Graph will be a 2D-array of edges. Each ...
Read MoreMaximum Sum of 3 Non-Overlapping Subarrays in C++
Suppose we have one array called nums of positive integers, we have to find three non-overlapping subarrays with maximum sum. Here each subarray will be of size k, and we want to maximize the sum of all 3*k entries.We have to find the result as a list of indices representing the starting position of each interval. If there are multiple answers, we will return the lexicographically smallest one.So if the input is like [1, 2, 1, 2, 6, 8, 4, 1] and k = 2, then the result will be [0, 3, 5], so subarrays are [1, 2], [2, 6], ...
Read MoreStickers to Spell Word in C++
Suppose we have N different types of stickers. In each type of sticker has a lowercase English word on it. We would like to spell out the given target string by cutting individual letters from our collection of stickers and rearranging them. We can use each sticker more than once if needed, and we have infinite quantities of each sticker.We have to find the minimum number of stickers that we need to spell out the target? If the task is impossible, return -1.So if the input is like [“dog”, “sentence”, ”antenna”], and target is “dance”, then the answer will be ...
Read MoreProgram to find the Area of a Parallelogram in C++
In this problem, we are given two values that denote the base and height of a parallelogram. Our task is to create a Program to find the Area of a Parallelogram in C++.Parallelogram is a four side closed figure that has opposite sides equal and parallel to each other.Let’s take an example to understand the problem, InputB = 20, H = 15Output300ExplanationArea of parallelogram = B * H = 20 * 15 = 300Solution ApproachTo solve the problem, we will use the geometrical formula for area of parallelogram, Area = base * height.Program to illustrate the working of our solution, ...
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