Problem	sum2
User	yc
Submission Time	2026-06-25 10:47:41
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

sum2.cpp: In function ‘int main()’:
sum2.cpp:10:21: error: no match for ‘operator-’ (operand types are ‘std::vector<int>’ and ‘int’)
10 | cout<<n1[n-1]+n1[n1-2];
| ~~^~
| | |
| | int
| std::vector<int>
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
from /usr/include/c++/9/bits/specfun.h:45,
from /usr/include/c++/9/cmath:1927,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:41,
from sum2.cpp:1:
/usr/include/c++/9/bits/stl_iterator.h:415:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)’
415 | operator-(const reverse_iterator<_IteratorL>& __x,