cyberland.cpp: In function 'double solve(int, int, int, int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
cyberland.cpp:28:27: error: no match for 'operator[]' (operand types are 'std::vector<int>' and 'std::pair<int, int>')
28 | if(arr[v].first != 2) {
| ^
In file included from /usr/include/c++/10/vector:67,
from /usr/include/c++/10/functional:62,
from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,
from /usr/include/c++/10/algorithm:74,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
from cyberland.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:1043:7: note: candidate: 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::reference = int&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]'
1043 | operator[](size_type __n) _GLIBCXX_NOEXCEPT
| ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1043:28: note: no known conversion for argument 1 from 'std::pair<int, int>' to 'std::vector<int>::size_type' {aka 'long unsigned int'}
1043 | operator[](size_type __n) _GLIBCXX_NOEXCEPT
| ~~~~~~~~~~^~~
/usr/include/c++/10/bits/stl_vector.h:1061:7: note: candidate: 'std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::const_reference = const int&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]'
1061 | operator[](size_type __n) const _GLIBCXX_NOEXCEPT
| ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1061:28: note: no known conversion for argument 1 from 'std::pair<int, int>' to 'std::vector<int>::size_type' {aka 'long unsigned int'}
1061 | operator[](size_type __n) const _GLIBCXX_NOEXCEPT
| ~~~~~~~~~~^~~