func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 200010;   int ans[MAXN];   void solve(int l, int r) {     if (l > r) return;     cout <<  ?   << l + 1 <<     << r + 1 << endl;     int x, f;     cin >> x >> f;     int st = r - f + 1;     int en = l + f - 1;     if (st <= en) {       for (int i = st, ThxDem = en + 1; i < ThxDem; ++i) ans[i] = x;       solve(l, st - 1);       solve(en + 1, r);     } else {       int m = (l + r) / 2;       solve(l, m);       solve(m + 1, r);     }   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int n;     cin >> n;     solve(0, n - 1);     cout <<  !  ;     for (int i = 0, ThxDem = n; i < ThxDem; ++i) cout << ans[i] <<    ;     cout << endl;   }   