How the answer is 6

#1

can you please let me know

#2

@swapnoneelmajumdar the questions are numbered randomly, please tell the complete question.

#3

I assume the question was

#include <bits/stdc++.h>
using namespace std;
int main()
{
    vector<int>v={20, 40, 30, 10 , 50, 30};
    sort(v.begin(), v.end());
    cout<<upper_bound(v.begin(), v.end(), 30)-v.begin();
    return 0;
}

here answer is 6 because
upper_bound(v.begin(), v.end(), 30)
gives an iterator at v.end()
so v.end()-v.begin() = size of v = 6

#4

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