Owl Get a Life

Compile Error

matheletes.cpp: In function ‘int main()’:
matheletes.cpp:27:16: error: no match for ‘operator-’ (operand types are ‘ll’ {aka ‘long long int’} and ‘std::pair<const long long int, long long int>’)
27 | if(um[k-c]!=0) total += min(um[k-c], um[c]);
| ~^~
| | |
| | std::pair<const long long int, long long int>
| ll {aka long long 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 matheletes.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::