Line 4: We do an if check, if the element at the index is equal to our target, we return the index, otherwise we exit the loop and return -1. Line 3: We use a for loop where we go through the vector making element and target comparisons. The function takes a vector and key k as its parameters, if the element exists, it returns the index, otherwise it returns -1 denoting absence of the element. Std::cout << searchResult(arr, k) << std::endl Int searchResult(std::vector arr, int k) The parameter passed here is key k, the function call will return an iterator pointing to key k in the vector. It = std::find(arr.begin(), arr.end(), k) In our case it will look like the following: Std::find() searches for an element equal to the value that is passed as a parameter and returns an iterator pointing to that element in the vector. Approach 1: Return index of the element using std::find() Here we use std::count().Īpproach 3: No STL here, we use linear search where by we go all through the vector elements making comparisons between the elements and key k. Here we use std::find() and std::find_if()Īpproach 2: By returning a boolean value, true if element is in the vector and false otherwise. There are three ways in which we can approach this problem:Īpproach 1: By returning the index position of the element in the vector. Vector should be trasnferred to a function that would calculate either sin(x)+cos(x) when x<1 or to a function that calculates sin(x)-cos(x) when x>1 and then returns the result back to the script.Create a script, where the vector x is generated from 0 to 2pi with a step 0,1. Basically STL contains some generic functions that we shall need for this tutorial. Create scripts and functions that would swap tha data only using global variables. The STL stands for Standard Template Library. Unlike arrays we can determine the size of a vector at runtime and that is what makes vectors a perfect choice for these types of scenarios, they are dynamically allocated which means they can be resized. Why vectors? Well, arrays in C++ are static and once declared we cannot change their sizes which is not favourable when we need to store a data set whose size we are unsure of. Introduction to Vector in C++ and STLĪ vector in C++ is just like an array in any other language but it is dynamic which means its size is not static. Let us get started with Different Ways to find element in Vector in C++ STL. Use std::find_if() with std::distance().Approach 1: Return index of the element using std::find().In this article, we have explained Different Ways to find element in Vector in C++ STL which includes using std::find(), std::find_if, std::distance, std::count and Linear Search.
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