func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<int> zp;   int zer;   int one;   int n;   int allz;   int q() {     cout <<  ?  <<    ;     for (int i = 0; i < n; i++) {       cout << zp[i];     }     cout << endl;     int x;     cin >> x;     return x;   }   void get(int bg, int ed, int W) {     if ((zer != -1) and (one != -1)) {       return;     }     int cur = W;     int L = ed - bg;     int d = cur - allz;     if (d == -L) {       one = bg;       return;     }     if (d == L) {       zer = bg;       return;     }     int mid = (bg + ed) / 2;     for (int i = mid; i < ed; i++) {       zp[i] = 0;     }     int D = q();     get(bg, mid, D);     for (int i = mid; i < ed; i++) {       zp[i] = 1;     }     if ((zer != -1) and (one != -1)) {       return;     }     for (int i = bg; i < mid; i++) {       zp[i] = 0;     }     get(mid, ed, W - D + allz);     for (int i = bg; i < mid; i++) {       zp[i] = 1;     }   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     cin >> n;     zp.resize(n);     zer = -1;     one = -1;     allz = q();     for (int i = 0; i < n; i++) {       zp[i] = 1;     }     get(0, n, n - allz);     cout <<  !   << zer + 1 <<     << one + 1 << endl;     return 0;   }   