func_code_string: #include <bits/stdc++.h>   using namespace std;   inline long long Calc(const int &x) {     long long res = 0;     for (long long i = 1; i <= x; i *= 10) res += x - i + 1;     return res;   }   inline long long CalcSum(const int &x) {     long long res = 0;     for (long long i = 1; i <= x; i *= 10)       res += 1ll * (x - i + 1) * (x - i + 2) / 2;     return res;   }   inline int Pos(const int &x, const int &k) {     stringstream ss;     ss << x;     string s;     ss >> s;     return s[k - 1] -  0 ;   }   inline int Solve(long long k) {     int l = 1, r = 1000000000;     while (l <= r) {       int mid = (l + r) / 2;       if (CalcSum(mid) >= k)         r = mid - 1;       else         l = mid + 1;     }     k = k - CalcSum(r);     int block = l;     l = 1;     r = block;     while (l <= r) {       int mid = (l + r) / 2;       if (Calc(mid) >= k)         r = mid - 1;       else         l = mid + 1;     }     return Pos(l, k - Calc(r));   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int q;     cin >> q;     while (q--) {       long long k;       cin >> k;       cout << Solve(k) <<   n ;     }     return 0;   }   