Language: Java

#include<bits/stdc++.h>
using namespace std;

#define double long double
#define int long long
#define vec vector
#define pb push_back
#define unset unordered_set
#define ii pair<int, int>
#define X first
#define Y second
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define FORE(i, a, b) for(int i = (a); i <= (b); i++)
#define FORD(i, a, b) for(int i = (a); i >= (b); i--)
#define bitcount(n) __builtin_popcountll(n)
template <typename T,typename U>
std::pair<T,U> operator+(const std::pair<T,U> & l,const std::pair<T,U> & r) {
  return {l.first+r.first,l.second+r.second};
} 
typedef void (*callback_function)(void); // type for conciseness
const long long ZERO = 0LL;
const long long INF64 = 1e18;
const int INF32 = 1e9;
const int MOD = 1e9 + 7;
const double PI = acos(-1.0L);
const double EPS = static_cast<double>(1e-9);
typedef long long ll;

inline int Pow(int a, int k) {
  int s = 1; 
  for(; k; k >>= 1) {
    k & 1 ? s = 1LL * s * a % MOD : 0;
    a = 1LL * a * a % MOD;
  }
  return s;
}

const int N = 1e6 + 7;

void input() {
  //freopen("??.in", "r", stdin);
  //freopen("??.out", "w", stdout);
}

void preprocess() {
}

void debug() {
  //  44gg
  if (true) {
  
  }
}



void solve() {
  preprocess();
  // 50gg
  int a, b;
  cin >> a >> b;
  int res = 0;
  b++;
  FOR(i, 0, 50) {
    int p = 1LL << (i + 1);
    int p2 = p / 2;
    //cerr << "p = " << p << endl;
    int L = (a / p) * p2;
    L += max(0LL, (a % p) - p2);
    int R = (b / p) * p2;
    R += max(0LL, (b % p) - p2);
    if ((R - L) % 2) {
      res |= p2;
    }
    //cerr << i << ' ' << p << ' ' << L << ' ' << R << ' ' << res << endl;
  }
  cout << res << endl;
  //debug();
  // read the question correctly (is y a vowel?)
  // look out for SPECIAL CASES (n=1?) and overflow (ll vs int?)
}

void output() {

}

#undef int
int main() {
#define int long long
	ios_base::sync_with_stdio(false);
	cin.tie();
  //auto beginProgram = chrono::steady_clock::now();

  //int t; cin >> t;
  //while (t--) 
  {
    input();
    solve();
    output();
  }

  //auto endProgram = chrono::steady_clock::now();

  return 0;
}



Compiler output:
Main.java:1: error: illegal character: '#'
#include<bits/stdc++.h>
^
Main.java:1: error: class, interface, enum, or record expected
#include<bits/stdc++.h>
        ^
Main.java:4: error: illegal character: '#'
#define double long double
^
Main.java:4: error: class, interface, enum, or record expected
#define double long double
        ^
Main.java:5: error: illegal character: '#'
#define int long long
^
Main.java:6: error: illegal character: '#'
#define vec vector
^
Main.java:7: error: illegal character: '#'
#define pb push_back
^
Main.java:8: error: illegal character: '#'
#define unset unordered_set
^
Main.java:9: error: illegal character: '#'
#define ii pair<int, int>
^
Main.java:10: error: illegal character: '#'
#define X first
^
Main.java:11: error: illegal character: '#'
#define Y second
^
Main.java:12: error: illegal character: '#'
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
^
Main.java:12: error: class, interface, enum, or record expected
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
                                      ^
Main.java:12: error: class, interface, enum, or record expected
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
                                               ^
Main.java:13: error: illegal character: '#'
#define FORE(i, a, b) for(int i = (a); i <= (b); i++)
^
Main.java:13: error: class, interface, enum, or record expected
#define FORE(i, a, b) for(int i = (a); i <= (b); i++)
                                       ^
Main.java:13: error: class, interface, enum, or record expected
#define FORE(i, a, b) for(int i = (a); i <= (b); i++)
                                                 ^
Main.java:14: error: illegal character: '#'
#define FORD(i, a, b) for(int i = (a); i >= (b); i--)
^
Main.java:14: error: class, interface, enum, or record expected
#define FORD(i, a, b) for(int i = (a); i >= (b); i--)
                                       ^
Main.java:14: error: class, interface, enum, or record expected
#define FORD(i, a, b) for(int i = (a); i >= (b); i--)
                                                 ^
Main.java:15: error: illegal character: '#'
#define bitcount(n) __builtin_popcountll(n)
^
Main.java:19: error: class, interface, enum, or record expected
} 
^
Main.java:21: error: class, interface, enum, or record expected
const long long ZERO = 0LL;
^
Main.java:22: error: class, interface, enum, or record expected
const long long INF64 = 1e18;
^
Main.java:23: error: class, interface, enum, or record expected
const int INF32 = 1e9;
^
Main.java:24: error: class, interface, enum, or record expected
const int MOD = 1e9 + 7;
^
Main.java:25: error: class, interface, enum, or record expected
const double PI = acos(-1.0L);
^
Main.java:26: error: class, interface, enum, or record expected
const double EPS = static_cast<double>(1e-9);
^
Main.java:27: error: class, interface, enum, or record expected
typedef long long ll;
^
Main.java:29: error: class, interface, enum, or record expected
inline int Pow(int a, int k) {
^
Main.java:31: error: class, interface, enum, or record expected
  for(; k; k >>= 1) {
  ^
Main.java:31: error: class, interface, enum, or record expected
  for(; k; k >>= 1) {
        ^
Main.java:31: error: class, interface, enum, or record expected
  for(; k; k >>= 1) {
           ^
Main.java:33: error: class, interface, enum, or record expected
    a = 1LL * a * a % MOD;
    ^
Main.java:34: error: class, interface, enum, or record expected
  }
  ^
Main.java:36: error: class, interface, enum, or record expected
}
^
Main.java:40: error: unnamed classes are a preview feature and are disabled by default.
void input() {
^
  (use --enable-preview to enable unnamed classes)
Main.java:61: error: not a statement
  cin >> a >> b;
           ^
Main.java:65: error: not a statement
    int p = 1LL << (i + 1);
                ^
Main.java:69: error: not a statement
    L += max(0LL, (a % p) - p2);
               ^
Main.java:69: error: not a statement
    L += max(0LL, (a % p) - p2);
                     ^
Main.java:69: error: not a statement
    L += max(0LL, (a % p) - p2);
                            ^
Main.java:71: error: not a statement
    R += max(0LL, (b % p) - p2);
               ^
Main.java:71: error: not a statement
    R += max(0LL, (b % p) - p2);
                     ^
Main.java:71: error: not a statement
    R += max(0LL, (b % p) - p2);
                            ^
Main.java:77: error: not a statement
  cout << res << endl;
              ^
Main.java:64: error: ';' expected
  FOR(i, 0, 50) {
               ^
Main.java:65: error: ';' expected
    int p = 1LL << (i + 1);
              ^
Main.java:69: error: ';' expected
    L += max(0LL, (a % p) - p2);
                ^
Main.java:69: error: ';' expected
    L += max(0LL, (a % p) - p2);
                        ^
Main.java:69: error: ';' expected
    L += max(0LL, (a % p) - p2);
                              ^
Main.java:71: error: ';' expected
    R += max(0LL, (b % p) - p2);
                ^
Main.java:71: error: ';' expected
    R += max(0LL, (b % p) - p2);
                        ^
Main.java:71: error: ';' expected
    R += max(0LL, (b % p) - p2);
                              ^
Main.java:87: error: illegal character: '#'
#undef int
^
Main.java:87: error: class, interface, enum, or record expected
#undef int
       ^
Main.java:89: error: illegal character: '#'
#define int long long
^
Main.java:91: error: class, interface, enum, or record expected
	cin.tie();
	^
Main.java:96: error: class, interface, enum, or record expected
  {
  ^
Main.java:98: error: class, interface, enum, or record expected
    solve();
    ^
Main.java:99: error: class, interface, enum, or record expected
    output();
    ^
Main.java:100: error: class, interface, enum, or record expected
  }
  ^
Main.java:105: error: class, interface, enum, or record expected
}
^
63 errors