Question

How to check if all elements of a vector are equal in C++

Answer 1

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

using std::cout;
using std::endl;
using std::vector;
using std::string;

int main()
{
	vector<string> vec = { "Maze", "Flux", "Jazz", "Buzz", "Quiz", "Jump" };


	if (std::equal(vec.begin() + 1, vec.end(), vec.begin()))
		cout << "All elements are equal" << endl;
	else
		cout << "Not all elements are equal" << endl;


	return 0;
}


/*
run:

Not all elements are equal

*/

 

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Answer 2

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

using std::cout;
using std::endl;
using std::vector;
using std::string;

int main()
{
	vector<string> vec = { "C++", "C++", "C++", "C++" };

	if (std::equal(vec.begin() + 1, vec.end(), vec.begin()))
		cout << "All elements are equal" << endl;
	else
		cout << "Not all elements are equal" << endl;

	return 0;
}


/*
run:

All elements are equal

*/

 

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