Language: C++

#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <regex>
#define rep(i,n) for(int i = 0; i < n; i++)
#define reps(i,j,n) for(int i = j; i < n; i++)
#define rrep(i,j,n) for(int i = j-1; i >= n; i--)
#define prec(n) fixed << setprecision(n)
#define print_array(v) rep(__k, v.size()) { cout << v[__k]; if(__k != v.size()-1) cout << " "; else cout << endl; }
#define YesorNo(a) printf(a?"Yes\n":"No\n")
#define fi first
#define se second
#define endl "\n"
using namespace std;

constexpr int inf = 2147483647;
constexpr int64_t inf64 = 9223372036854775807;
constexpr int mod = 1e9+7;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int64_t n, a, b;
  cin >> n >> a >> b;

  int64_t diff = b - a;
  if(diff % 2LL == 0LL) cout << diff / 2LL << endl;
  if(diff % 2LL == 1LL) cout << min(b-1LL, n-a) << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:77:36: error: no matching function for call to 'min(long long int, int64_t)'
   77 |   if(diff % 2LL == 1LL) cout << min(b-1LL, n-a) << endl;
      |                                 ~~~^~~~~~~~~~~~
In file included from /usr/include/c++/14/bits/specfun.h:43,
                 from /usr/include/c++/14/cmath:3906,
                 from a.cc:10:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:77:36: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int64_t' {aka 'long int'})
   77 |   if(diff % 2LL == 1LL) cout << min(b-1LL, n-a) << endl;
      |                                 ~~~^~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:20:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:77:36: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   77 |   if(diff % 2LL == 1LL) cout << min(b-1LL, n-a) << endl;
      |                                 ~~~^~~~~~~~~~~~