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Articles on Trending Technologies
Technical articles with clear explanations and examples
Does C++ compiler create default constructor when we write our own?
In this tutorial, we will be discussing a program to understand if the C++ compiler creates a default constructor when we write our own.Generally, the C++ compiler uses the default constructor when no one is defined, but always uses the one defined by the user if any.Example#include using namespace std; class myInteger{ private: int value; //other functions in class }; int main(){ myInteger I1; getchar(); return 0; }OutputCompiles successfullyExample#include using namespace std; class myInteger{ private: int value; public: myInteger(int v) //user-defined constructor { value = v; ...
Read MoreLast Stone Weight II in C++
Suppose we have a collection of rocks, now each rock has a positive integer weight. In each turn, we choose any two rocks and smash them together. If the stones have weights x and y with x = 0, decrease j by 1dp[j] := false when (dp[j] and dp[j – stones[i]]) both are false, otherwise trueif dp[j] is true, then reach := max of reach and jreturn total – (2 * reach)Let us see the following implementation to get better understanding −Example#include using namespace std; class Solution { public: int lastStoneWeightII(vector& stones) { int ...
Read MoreShortest Way to Form String in C++
Suppose we have a string, we can form a subsequence of that string by deleting some number of characters (possibly no deletions). So if there is two strings source and target, we have to find the minimum number of subsequences of source such that their concatenation equals target. If the task is impossible, then return -1. So if source is “abc” and target is “abcbc”, then the output will be 2.To solve this, we will follow these steps −Define a string called possible, this will take s and t as inputcreate a map mfor each character c in s mark ...
Read MorePick maximum sum M elements such that contiguous repetitions do not exceed K in C++
In this problem, we are given array arr[] and two integers M and K. our task is to create an Array using elements of the given array. The size of the new array should M and any sub-array of size greater than K cannot have all elements the same. we have to print the maximum sum possible by the created array.Let’s take an example to understand the problemInput − arr[] = {1, 2, 4, 5, 7 }, M = 5, K = 2Explanation − array created that satisfies the condition {7, 7, 5, 7, 7}. Here, no sub-array with size ...
Read MoreUnique Substrings in Wraparound String in C++
Suppose we have the string s to be the infinite wraparound string of "abcdefghijklmnopqrstuvwxyz", so the value s will look like this − "...zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd....".Now we have another string p. Our job is to find out how many unique non-empty substrings of p are present in s. In particular, our input is the string p and we need to output the number of different non-empty substrings of p in the string s.So if the input is like “zab” the output will be 6. There are 6 substrings “z”, “a”, “b”, “za”, “ab”, “zab” of the string “zab” in the string sTo ...
Read MoreMinimize Rounding Error to Meet Target in C++
Suppose we have an array of prices P [p1, p2..., pn] and a target value, we have to round each price Pi to Roundi(Pi) so that the rounded array [Round1(P1), Round2(P2)..., Roundn(Pn)] sums to the given target value. Here each operation Roundi(pi) could be either Floor(Pi) or Ceil(Pi).We have to return the string "-1" if the rounded array is impossible to sum to target. Otherwise, return the smallest rounding error, which will be (as a string with three places after the decimal) defined as −$\displaystyle\sum\limits_{i-1}^n |Round_{i} (???? ) - ????$So if the input is like [“0.700”, “2.800”, “4.900”], and the ...
Read MoreExclusive Time of Functions in C++
Suppose on a single threaded CPU, we execute some functions. Now each function has a unique id between 0 and N-1. We will store logs in timestamp order that describe when a function is entered or exited.Here each log is a string written this format: "{function_id}:{"start" | "end"}:{timestamp}". For example, if the string is like "0:start:3" this means that the function with id 0 started at the beginning of timestamp 3. "1:end:2" means the function with id 1 ended at the end of timestamp 2. A function's exclusive time is the number of units of time spent in this function.So ...
Read MoreMaximum Sum Circular Subarray in C++
Suppose we have a circular array C of integers represented by A, we have to find the maximum possible sum of a non-empty subarray of C. Also, a subarray may only include each element of the fixed buffer A at most once. If the array is like [1, -2, 3, -2], then the output will be 3. This is because subarray[3] has maximum sum 3.To solve this, we will follow these steps −n := size of vcreate arrays leftSum, leftSumMax, rightSum, rightSumMax all of size nleftSum[0] := v[0], leftSumMax[0] := maximum of 0 and v[0]for i in range 1 to ...
Read MoreShopping Offers in C++
Suppose there is a store, there are some items to sell. Each item has some price. However, there are some special offers, and a special offer consists of one or more different kinds of items with a sale price. So we have the list of prices, a set of special offers, and the number we need to buy for each item. The task is to find the lowest price we have to pay for exactly certain items as given, where we could make optimal use of the special offers.Here each special offer is represented in the form of an array, ...
Read MoreValidate Stack Sequences in C++
Suppose we have two sequences pushed and popped with distinct values, we have to find true if and only if this could have been the result of a sequence of the push and pop operations on an initially empty stack. So if the input is push = [1, 2, 3, 4, 5], and pop = [4, 5, 3, 2, 1], then the output will be true. We can use push(1), push(2), push(3), push(4), pop() : 4, push(5), pop() : 5, pop() : 3, pop() : 2, pop() : 1To solve this, we will follow these steps −Create one method called ...
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