Language: C++

//Be Name Khoda, Besmellah Rahmane Rahim, In The Name Of God;
//#include<bits/stdc++.h>
#include<iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <set>
#include <queue>
#include <deque>
#include <map>
#include <stack>
#include<bitset>
#include<list>
#include<cassert>
#include<numeric>
#include <stdio.h>
#include <string.h>
#include<iomanip>
#include<unordered_map>
#include<unordered_set>
#include <fstream>

using namespace std;
 


 
const int B = 61;
int a, b;
int p;
int ans;
 
int main()
{
    cin >> a >> b;
    if (a == b) 
    {
        cout << 1 << endl;
        return;
    }
    for (int i = B - 1; i >= 0; i--)
    {
        if ((b & (1ll << i)) && !(a & (1ll << i)))
        {
            p = i;
            for (int k = p - 1; k >= 0; k--)
            {
                if (b & (1ll << k))
                {
                    b |= ((1ll << (k + 1)) - 1);
                    break;
                }
            }
            break;
        }
    }
    int l = a + (1ll << p);
    int r = a | ((1ll << (p + 1)) - 1);
    ans += max(0ll, b - a + 1);
    ans += max(0ll, r - l + 1);
    ans -= max(0ll, b - l + 1);
    cout << ans << '\n';
}







Compiler output:
a.cc: In function 'int main()':
a.cc:39:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
   39 |         return;
      |         ^~~~~~
a.cc:59:15: error: no matching function for call to 'max(long long int, int)'
   59 |     ans += max(0ll, b - a + 1);
      |            ~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:3:
/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:59:15: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   59 |     ans += max(0ll, b - a + 1);
      |            ~~~^~~~~~~~~~~~~~~~
/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,
                 from a.cc:5:
/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:59:15: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   59 |     ans += max(0ll, b - a + 1);
      |            ~~~^~~~~~~~~~~~~~~~
a.cc:60:15: error: no matching function for call to 'max(long long int, int)'
   60 |     ans += max(0ll, r - l + 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:60:15: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   60 |     ans += max(0ll, r - l + 1);
      |            ~~~^~~~~~~~~~~~~~~~
/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
/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:60:15: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   60 |     ans += max(0ll, r - l + 1);
      |            ~~~^~~~~~~~~~~~~~~~
a.cc:61:15: error: no matching function for call to 'max(long long int, int)'
   61 |     ans -= max(0ll, b - l + 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:61:15: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   61 |     ans -= max(0ll, b - l + 1);
      |            ~~~^~~~~~~~~~~~~~~~
/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
/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:61:15: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   61 |     ans -= max(0ll, b - l + 1);
      |            ~~~^~~~~~~~~~~~~~~~