how to check if vector is ordered c++
#include <vector> // vector
#include <algorithm> // is_sorted
#include <iostream> // cout
using namespace std;
int main()
{
vector<int> a = {6,5,3,5,7,8,5,2,1};
vector<int> b = {1,2,3,4,5,6,7,8,9};
if(is_sorted(a.begin(), a.end()))
cout << "a is sorted\n";
else
cout << "a is not sorted\n";
if(is_sorted(b.begin(), b.end()))
cout << "b is sorted\n";
else
cout << "b is not sorted\n";
}