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Technical articles with clear explanations and examples
Program to find trailing zeros in factorial of n in C++?
Suppose we have a number n, we have to find the number of trailing zeros of n!.So, if the input is like n = 20, then the output will be 4, as 20! = 2432902008176640000To solve this, we will follow these stepsset count := 0for i := 5, (n/i) > 1, update i := i * 5, docount := count + (n /i)return countLet us see the following implementation to get better understandingExample#include #include #define MAX 20 using namespace std; int countTrailingZeros(int n) { int count = 0; for (int i = 5; n / i >= 1; i *= 5) count += n / i; return count; } main() { int n = 20; cout
Read MoreCount substrings that starts with character X and ends with character Y in C++
We are given string str. The goal is to count the number of substrings in str that have starting character same as character X and ending character same as character Y. For example, if input is “artact” and X=’a’ and Y=’t’, the substrings will be “art”, “act”, “artact”. The count is 3.Let us understand with examples.Input − str=”abcccdef” X=’a’ Y=’c’Output −Count of substrings that starts with character X and ends with Y is − 3Explanation − Substrings will be“abc”, “abcc”, “abccc”. Total 3.Input − str=”tempest” X=’t’ Y=’t’Output − Count of substrings that starts with character X and ends with Y ...
Read MoreHow to create a random sample of months in R?
Random samples can be created by using sample function and months in a year can be generated with the help of month.name function. Therefore, if we want to create a random sample of months then month.name can be used with sample function as sample(month.name) and if the size of the sample is larger than 12 then replace=TRUE argument should be used.Examplesx1
Read MoreCount subsets having distinct even numbers in C++
We are given an array of positive integers. The goal is to find the subsets of numbers in an array such that each subset has distinct even numbers in it. All sets with the same elements will be counted as 1. [2, 4, 6] and [6, 2, 4] are the same set.Let us understand with examplesInput − arr[] = {1, 3, 5, 7, 8, 3, 2 };Output −Count of subsets having distinct even numbers are − 3Explanation − Subsets will be − [2], [8], [2, 8]Input − arr[] = {2, 4, 6 };Output −Count of subsets having distinct even numbers ...
Read MoreHow to replace "and" in a string with "&" in R?
We know that the word “and” can be written as “&”. If we have vectors that contain string values separated with word “and” then we can replace it with “&”. To do this, we can use stri_replace_last function of stringi package. For example, if we have a string vector that contain only one element defined as x
Read MoreCount subsequence of length three in a given string in C++
We are given string str and a substring sub_str of length 3. The goal is to find the count of subsequence sub_str in str. Example “act” is thrice in “cataract” ( cataract, cataract, cataract ).Let us understand with examples.Input − str= “settlement” sub_str=”set”Output − Count of a subsequence of length three in a given string are: 5Explanation − Subsequences will be −1. set tlement, 2. se t t lement, 3. se ttlemen t, 4. s ettl e men t, 5. settlem e n tInput − str= “knowledge” sub_str=”now”Output − Count of a subsequence of length three in a given string ...
Read MoreCount subarrays with same even and odd elements in C++
We are given an array of positive integers. The goal is to find the subarrays of numbers in an array such that each subarray has the same number of even and odd elements in it. If the array is { 1, 2, 3, 4 }. Then subarrays will be {1, 2}, {2, 3}, {3, 4}, {1, 2, 3, 4}. Count of such subarrays is 4.Let us understand with examplesInput − arr[] = {1, 3, 5, 7, 8, 3, 2 };Output − Count of subarrays with same even and odd elements are − 4Explanation − Subarrays will be − { 7, ...
Read MoreHow to find the combination of multiplication of integers up to a certain value in R?
Suppose we want to find the total number of combinations of two numbers, say, 1 and 2 and then multiply each of the combination values. This will result in the following combinations −1 1 1 2 2 1 2 2And the multiplication will also have a third column as shown below −Multiplication 1 1 1 1 2 2 2 1 2 2 2 4Example1for (i in 1:5) for (j in 1:3) cat(i,j,i*j, "") Output1 1 1 1 2 2 1 3 3 2 1 2 2 2 4 2 3 6 3 1 3 3 2 6 3 3 9 4 1 4 4 2 8 4 3 12 5 1 5 5 2 10 5 3 15Example4for (i in 1:4) for (j in 1:6) cat(i,j,i*j, "") Output1 1 1 1 2 2 1 3 3 1 4 4 1 5 5 1 6 6 2 1 2 2 2 4 2 3 6 2 4 8 2 5 10 2 6 12 3 1 3 3 2 6 3 3 9 3 4 12 3 5 15 3 6 18 4 1 4 4 2 8 4 3 12 4 4 16 4 5 20 4 6 24
Read MoreCount subarrays with Prime sum in C++
We are given an array of positive integers. The goal is to find the subarrays of numbers in an array such that each subarray has the sum as prime. If the array is { 1, 2, 3, 4 }. Then subarrays will be {1, 2}, {2, 3}, {3, 4}. Count of such subarrays is 3.Let us understand with examplesInput − arr[] = {1, 3, 5, 3, 2 };Output − Count of subarrays with Prime sum are: 3Explanation − Subarrays will be : { 3, 2} sum=5 prime, {3, 5, 3} sum=11 prime and {3, 5, 3, 2} sum is 13 ...
Read MoreCount total number of digits from 1 to N in C++
We are given a number N as input. The goal is to count the total number of digits between numbers 1 to N. 1 to 9 numbers require 1 digit each, 11 to 99 require 2 digits each, 100 to 999 require 3 digits each and so on.Let us understand with examplesInput − N=11Output − Count of total number of digits from 1 to N are: 13Explanation − Numbers 1 to 9 has 1 digit each : 9 digits 10, 11 have 2 digits each. 4 digits. Total digits= 9+4=13.Input − N=999Output − Count of the total number of digits ...
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