Problem	railway
User	goose
Submission Time	2026-09-26 15:27:25
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

railway.cpp: In function ‘void dfs(long long int, long long int, long long int)’:
railway.cpp:12:17: error: no match for ‘operator!=’ (operand types are ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, long long int> >, std::pair<long long int, long long int> >::value_type’ {aka ‘std::pair<long long int, long long int>’} and ‘long long int’)
12 | if (adj[i][j] != pa) {
In file included from /usr/include/c++/9/regex:62,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
from railway.cpp:1:
/usr/include/c++/9/bits/regex.h:1037:5: note: candidate: ‘template<class _BiIter> bool std::__cxx11::operator!=(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)’
1037 | operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
| ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1037:5: note: