Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,N) for(int i=0,i##_max=(N);i<i##_max;++i)
#define repp(i,l,r) for(int i=(l),i##_max=(r);i<i##_max;++i)
#define per(i,N) for(int i=(N)-1;i>=0;--i)
#define perr(i,l,r) for(int i=r-1,i##_min(l);i>=i##_min;--i)
#define all(arr) (arr).begin(), (arr).end()
#define SP << " " <<
#define SPF << " "
#define SPEEDUP cin.tie(0);ios::sync_with_stdio(false);
#define MAX_I INT_MAX //1e9
#define MIN_I INT_MIN //-1e9
#define MAX_UI UINT_MAX //1e9
#define MAX_LL LLONG_MAX //1e18
#define MIN_LL LLONG_MIN //-1e18
#define MAX_ULL ULLONG_MAX //1e19
typedef long long ll;
typedef pair<int,int> PII;
typedef pair<char,char> PCC;
typedef pair<ll,ll> PLL;
typedef pair<char,int> PCI;
typedef pair<int,char> PIC;
typedef pair<ll,int> PLI;
typedef pair<int,ll> PIL; 
typedef pair<ll,char> PLC; 
typedef pair<char,ll> PCL; 

inline void YesNo(bool b){ cout << (b?"Yes" : "No") << endl;}
inline void YESNO(bool b){ cout << (b?"YES" : "NO") << endl;}
inline void Yay(bool b){ cout << (b?"Yay!" : ":(") << endl;}

template<int MOD> struct Fp {
    ll val;
    constexpr Fp(ll v = 0) noexcept : val(v % MOD) {
        if (val < 0) v += MOD;
    }
    constexpr int getmod() { return MOD; }
    constexpr Fp operator - () const noexcept {
        return val ? MOD - val : 0;
    }
    constexpr Fp operator + (const Fp& r) const noexcept { return Fp(*this) += r; }
    constexpr Fp operator - (const Fp& r) const noexcept { return Fp(*this) -= r; }
    constexpr Fp operator * (const Fp& r) const noexcept { return Fp(*this) *= r; }
    constexpr Fp operator / (const Fp& r) const noexcept { return Fp(*this) /= r; }
    constexpr Fp& operator += (const Fp& r) noexcept {
        val += r.val;
        if (val >= MOD) val -= MOD;
        return *this;
    }
    constexpr Fp& operator -= (const Fp& r) noexcept {
        val -= r.val;
        if (val < 0) val += MOD;
        return *this;
    }
    constexpr Fp& operator *= (const Fp& r) noexcept {
        val = val * r.val % MOD;
        return *this;
    }
    constexpr Fp& operator /= (const Fp& r) noexcept {
        long long a = r.val, b = MOD, u = 1, v = 0;
        while (b) {
            long long t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        val = val * u % MOD;
        if (val < 0) val += MOD;
        return *this;
    }
    constexpr bool operator == (const Fp& r) const noexcept {
        return this->val == r.val;
    }
    constexpr bool operator != (const Fp& r) const noexcept {
        return this->val != r.val;
    }
    friend constexpr ostream& operator << (ostream &os, const Fp<MOD>& x) noexcept {
        return os << x.val;
    }
    friend constexpr istream& operator >> (istream &is, Fp<MOD>& x) noexcept {
        return is >> x.val;
    }
    friend constexpr Fp<MOD> modpow(const Fp<MOD> &a, long long n) noexcept {
        if (n == 0) return 1;
        auto t = modpow(a, n / 2);
        t = t * t;
        if (n & 1) t = t * a;
        return t;
    }
};


//const int MOD = 998244353;
//const int MOD = 1e6 + 3;
const int MOD = 1e9 + 7;
const int N_MAX = 1e5+5;
//mint:mod演算のための型
using mint = Fp<MOD>;
//型変換
#define MINT (mint)

//mod MOD上での階乗
mint fact[N_MAX];
void init(){
  fact[0] = fact[1] = MINT 1;
  for(int i = 2; i < N_MAX; i++){
    fact[i] = fact[i-1] * i;
  }
}

//mod MOD上での逆元
inline mint inv(mint n){
  return MINT 1/n;
}

//二項係数の計算(mod MOD上)
inline mint COM(int n, int k){
  if(n<k) return 0;
  if(k<0) return 0;
  return fact[n]/(fact[k]*fact[n-k]);
}

vector<int> divisor(int n){
  vector<int> v;
  for(int i=1; i<=sqrt(n); i++){
    if(n%i == 0){
      v.push_back(i);
      if(i!=n/i) v.push_back(n/i);
    }
  }
  sort(all(v));
  return v;
}

int main(void){
  SPEEDUP
  cout << setprecision(15);
  int N;cin >> N;
  string s;cin >> s;
  vector<int> v = divisor(N);
  mint num = 0;
  mint n_2 = 1;
  rep(i,N){
    if(s[N-i-1] == '1') num += n_2;
    n_2*=MINT 2;
  }
  mint ans = 0;
  for(const int & x : v){
    if(i==0||i==N||x%2==0)continue;
    string sp[2];
    sp[0] = string(N/x,'0');
    sp[1] = string(N/x,'1');
    string t,u;
    rep(i,x){
      if(i%2){
        t += sp[0];
        u += sp[1];
      }else{
        t += sp[1];
        u += sp[0];
      }
    }
    if(t<=s){
      num-=MINT 1;
      ans += MINT 2*x;
    }
    if(u<=s){
      num-=MINT 1;
      ans += MINT 2*x;
    }
  }
  if(N&1){
    string sp[2];
    sp[0] = string(1,'0');
    sp[1] = string(1,'1');
    string t,u;
    rep(i,N){
      if(i%2){
        t += sp[0];
        u += sp[1];
      }else{
        t += sp[1];
        u += sp[0];
      }
    }
    if(t<=s){
      num-=MINT 1;
      ans += MINT 2*x;
    }
    if(u<=s){
      num-=MINT 1;
      ans += MINT 2*x;
    }
  }
  ans += MINT 2*N*num;
  cout << ans << endl;
  return 0;
} 



Compiler output:
a.cc: In function 'int main()':
a.cc:148:8: error: 'i' was not declared in this scope
  148 |     if(i==0||i==N||x%2==0)continue;
      |        ^
a.cc:187:21: error: 'x' was not declared in this scope
  187 |       ans += MINT 2*x;
      |                     ^
a.cc:191:21: error: 'x' was not declared in this scope
  191 |       ans += MINT 2*x;
      |                     ^