Language: C++

#include <algorithm>
#include <cmath>
#include <cstdio>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_set>
#include <vector>

using namespace std;

#define ll long long
#define P pair<int, int>
#define FOR(i, N) for (int i = 0; i < (int)N; i++)
#define FORIN(i, a, b) for (int i = a; i < (int)b; i++)
#define ALL(x) (x).begin(), (x).end()
#define GI(name) \
  int(name);     \
  scanf("%d", &(name))
#define GI2(name1, name2) \
  int(name1), (name2);    \
  scanf("%d %d", &(name1), &(name2))
#define GI3(name1, name2, name3) \
  int(name1), (name2), (name3);  \
  scanf("%d %d %d", &(name1), &(name2), &(name3))
#define GVI(name, size)    \
  vector<int>(name)(size); \
  FOR(i, (size)) scanf("%d", &(name)[i])
#define GS(name) \
  string(name);  \
  cin >> (name);
#define MOD 1000000007
#define DEBUG(...) debug(__LINE__, ":" __VA_ARGS__)

string to_string(string s) {
  return s;
}

template <class T>
string to_string(vector<T> v) {
  string ret = "{";
  FOR(i, v.size() - 1) { ret += to_string(v[i]) + ","; }
  if (v.size() > 0) {
    ret += to_string(v.back());
  }
  ret += "}";
  return ret;
}

void debug() {
  cerr << endl;
}

template <class Head, class... Tail>
void debug(Head head, Tail... tail) {
  cerr << to_string(head) << " ";
  debug(tail...);
}

void print() {
  cout << endl;
}

template <class Head, class... Tail>
void print(Head head, Tail... tail) {
  cout << to_string(head);
  print(tail...);
}

int main() {
  ll a, b, x;
  cin >> a >> b >> x;
  ll n1 = (a - 1) / x, n2 = b / x;
  print(max(0, n2 - n1));
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:78:12: error: no matching function for call to 'max(int, long long int)'
   78 |   print(max(0, n2 - n1));
      |         ~~~^~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:78:12: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   78 |   print(max(0, n2 - n1));
      |         ~~~^~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:78:12: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   78 |   print(max(0, n2 - n1));
      |         ~~~^~~~~~~~~~~~