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how to find index of a vector in c++

answered on June 16, 2022 Popularity 10/10 Helpfulness 9/10

answer how to find index of a vector in c++

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how to find index of a vector in c++

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#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
	vector<int> v = { 7, 3, 6, 2, 6 };
	int key = 6;
	vector<int>::iterator itr = find(v.begin(), v.end(), key);
	int index = distance(v.begin(), itr);
	cout << index << endl;

	return 0;
}

Popularity 10/10 Helpfulness 9/10 Language cpp

Source: Grepper

Tags: c++ find vector

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Contributed on Jun 16 2022

0 Answers Avg Quality 2/10

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find index in vector c++

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find index in vector c++

// C++ program to find the index
// of an element in a vector
#include <bits/stdc++.h>
using namespace std;
  
// Function to print the
// index of an element
void getIndex(vector<int> v, int K)
{
    auto it = find(v.begin(), v.end(), K);
  
    // If element was found
    if (it != v.end()) 
    {
      
        // calculating the index
        // of K
        int index = it - v.begin();
        cout << index << endl;
    }
    else {
        // If the element is not
        // present in the vector
        cout << "-1" << endl;
    }
}
// Driver Code
int main()
{
    // Vector
    vector<int> v = { 1, 45, 54, 71, 76, 17 };
    // Value whose index
    // needs to be found
    int K = 54;
    getIndex(v, K);
    return 0;
}

Popularity 9/10 Helpfulness 4/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++

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Contributed on Feb 27 2023

Calm Caterpillar

0 Answers Avg Quality 2/10

how to find index of a vector in c++

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