func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = int64_t;   using ull = uint64_t;   using ld = long double;   using vi = vector<int64_t>;   using pii = pair<int64_t, int64_t>;   ll powr(ll a, ll b) {     ll res = 1;     while (b) {       if (b & 1) res = (res * a);       a = (a * a);       b >>= 1;     }     return res;   }   void solve() {     int64_t n, k;     cin >> n >> k;     k++;     int64_t a[n];     for (int64_t i = 0; i < n; i++) {       cin >> a[i];       a[i] = powr(10, a[i]);     }     sort(a, a + n);     int64_t ans = 0;     for (int64_t i = 0; i < n - 1 && k > 0; i++) {       int64_t den = min(k, (a[i + 1] / a[i]) - 1);       ans += a[i] * den;       k -= den;     }     if (k > 0) {       ans += a[n - 1] * k;     }     cout << ans <<   n ;   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int64_t t;     cin >> t;     while (t--) solve();   }   