Language: C++

// template version 1.6
// {{{ define basic macro
using namespace std;
#include <iostream>
#include <bits/stdc++.h>
// varibable settings
#define int long long
#define INF 1000000000000000000LL
// #define INF 2147483647
#define MOD 1000000007LL
// #define MOD 998244353LL
#define infile "../test/sample-1.in"

#define _overload3(_1,_2,_3,name,...) name
#define _rep(i,n) repi(i,0,n)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define rep(...) _overload3(__VA_ARGS__,repi,_rep,)(__VA_ARGS__)
#define _rrep(i,n) rrepi(i,0,n)
#define rrepi(i,a,b) for(int i=(int)(b-1);i>=(int)(a);--i)
#define rrep(...) _overload3(__VA_ARGS__,rrepi,_rrep,)(__VA_ARGS__)
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define pb(a) push_back(a)
#define mp(a, b) make_pair(a, b)
#define uni(x) sort(all(x));x.erase(unique(all(x)),x.end())
#define ten(n) ((int)1e##n)
template<class T, size_t N> size_t sza(const T (&array)[N]) { return N; }
template<class T> inline void chmax(T &a, const T &b) { if(a < b) a = b; }
template<class T> inline void chmin(T &a, const T &b) { if(a > b) a = b; }
template<class T=int> T in() {T x; cin>>x; return (x);}
struct Fast { Fast(){ std::cin.tie(0); ios::sync_with_stdio(false); } } fast;

// dump macro
#ifdef PCM
  #include "dump.hpp"
#else
  #define dump(...) 42
  #define dump_1d(...) 42
  #define dump_2d(...) 42
#endif

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef long double ld;
typedef pair<int,int> pii;
typedef tuple<int,int,int> iii;
template<typename T> using PQ = priority_queue<T, vector<T>, greater<T>>;
int dx[]={1, -1, 0, 0};
int dy[]={0, 0, 1, -1};
#define fi first
#define se second

// }}}

string tob(int n, int m) {
  stringstream ss;
  ss << bitset<17>(m);
  return ss.str().substr(17-n, n);
}

vector<string> calc(int n, int s, int e) {
  // s,eで異なる桁dを探す。
  // その桁を除いた問題を解けばよい。
  // 接続点はsを反転したものを使う。これがeと等しいなら初めの桁を変更する。
  dump(tob(n, s));
  dump(tob(n, e));
  string ss = tob(n, s);
  string es = tob(n, e);

  int d;
  rep(i, n){
    if (ss[i]!=es[i]){
      d=i;
      break;
    }
  }

  string ns="";
  string ne="";
  rep(i, n){
    if (i==d) continue;
    else {
      ns += ss[i];
      ne += ss[i]=='1'?'0':'1';
    }
  }
  if (ns==ne) ne = (ne[0]=='1'?'0':'1' + ne.substr(1));

  vector<string> pres = solve(n-1, ns, ne);
  vector<string> res;
  for(auto x:pres){
    string tmp="";
    tmp += x.substr(0, d);
    tmp += ss[d];
    tmp += x.substr(d, n-d);
    res.pb(tmp);
  }
  return res;
}

int solve(){
  int n;cin>>n;
  int a,b;cin>>a>>b;
  // dump(n, a, b);
  // dump(calc(n, a, b));

  for (auto &x : calc(n, a, b)){
    cout << x << endl;
  }

  return 0;
}

signed main() { //{{{
#ifdef INPUT_FROM_FILE
  std::ifstream in(infile);
  std::cin.rdbuf(in.rdbuf());
#endif
  solve();
  return 0;
} //}}}


Compiler output:
a.cc: In function 'std::vector<std::__cxx11::basic_string<char> > calc(long long int, long long int, long long int)':
a.cc:88:31: error: operands to '?:' have different types 'char' and 'std::__cxx11::basic_string<char>'
   88 |   if (ns==ne) ne = (ne[0]=='1'?'0':'1' + ne.substr(1));
a.cc:90:25: error: 'solve' was not declared in this scope
   90 |   vector<string> pres = solve(n-1, ns, ne);
      |                         ^~~~~