Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
Large to Small Sort in C++
Suppose we have a list of integers nums, we have to sort the list in this manner −First element is maximumSecond element is minimumThird element is 2nd maximumFourth element is 2nd minimumAnd so on.So, if the input is like [6,3,10,4], then the output will be [10, 3, 6, 4]To solve this, we will follow these steps −Define an array retsort the array numsj := size of nums - 1i := 0while i
Read MoreBeer Bottles in C++
Suppose we have one number n. Here n indicates n full beer bottles. If we can exchange 3 empty beer bottles for 1 full beer bottle, we have to find the number of beer bottles we can drink.So, if the input is like 10, then the output will be 14.To solve this, we will follow these steps −Define a function solve(), this will take n, ret := 0while n >= 3, do −q := n / 3ret := ret + q * 3n := n - q * 3n := n + qret := ret + nreturn retLet us see ...
Read MoreHow to determine the row that have min and max values in an R data frame column?
In data analysis, often we require to determine the minimum and maximum values because these values help us to understand the limits of a column or variable under consideration. This can be done by using which.max for maximum and which.min for minimum with single square brackets to extract the rows.ExampleConsider the below data frame −x1
Read MoreMost Frequent Number in Intervals in C++
Suppose we have a list of lists of integers intervals where each element has interval like [start, end]. We have to find the most frequently occurred number in the intervals. If there are ties, then return the smallest number.So, if the input is like [[2, 5], [4, 6], [7, 10], [8, 10]], then the output will be 4To solve this, we will follow these steps −Define one map mcnt := 0, val := 0for each value it in x −(increase m[it[0]] by 1)decrease m[it[1] + 1] by 1last := 0for each key it in mlast := last + value of ...
Read MoreRevolving Door in C++
Suppose we have a list of requests, where requests[i] contains [t, d] indicating at time t, a person arrived at the door and either wanted to go inside (inside is indicating using 1) or go outside (outside is indicating using 0).So if there is only one door and it takes one time unit to use the door, there are few rules that we have to follow −The door starts with 'in' position and then is set to the position used by the last participant.If there's only one participant at the door at given time t, they can use the door.If ...
Read MoreUnique Fractions in C++
Suppose we have a list of fractions where each fraction contains [numerator, denominator] (numerator / denominator). We have ti find a new list of fractions such that the numbers in fractions are −In their most reduced terms. (20 / 14 becomes 10 / 7).Any duplicate fractions (after reducing) will be removed.Sorted in ascending order by their actual value.If the number is negative, the '-' sign will be with the numerator.So, if the input is like {{16, 8}, {4, 2}, {7, 3}, {14, 6}, {20, 4}, {-6, 12}}, then the output will be [[-1, 2], [2, 1], [7, 3], [5, 1]]To ...
Read MoreTV Shows in C++
Suppose we have a list of TV shows, and another list of duration, and an integer k, here shows[i] and duration[i] shows the name and duration watched by the ith person, we have to find the total duration watched of the k most watched shows.So, if the input is like shows: ["Castle Play", "Fairy Tale Series", "Castle Play", "Jerry Mouse", "Rich Boy"], duration: [6, 4, 6, 14, 5] and k = 2, then the output will be 26.To solve this, we will follow these steps −Define one map mn := size of vfor initialize i := 0, when i < ...
Read MoreHow to save the summary statistics into a data frame in R?
When we find the summary statistics of a data frame then the output is returned as a table and each of the column records the minimum, first quartile, median, median, third quartile, and maximum with their names. If we want to save this summary as a data frame then it is better to calculate it with apply function and store it as data.frame.ExampleConsider the below data frame −x1
Read MoreMinimum String in C++
Suppose we have two strings s and t of same length, and both are in lowercase letters. Consider we have rearranged s at first into any order, then count the minimum number of changes needed to turn s into t.So, if the input is like s = "eccynue", t = "science", then the output will be 2 as if we rearrange "eccynue" to "yccence", then replace y with s and second c with i, it will be "science".To solve this, we will follow these steps −ret := 0Define two arrays cnt1 to hold frequency of s and cnt2 to hold ...
Read MoreWhere is an object stored if it is created inside a block in C++?
In this section we will discuss about where the variables and objects are stored in the memory when a C++ program is compiled. As we know, there are two parts of memory in which an object can be stored −Stack − All members that are declared inside block of memory, it stores inside the stack section. The main function is also a function, so elements inside it will be stored inside the stack.Heap − When some objects are allocated dynamically, then that is stored inside the heap section.The scope of the object declared inside a block or a function is ...
Read More