func_code_string: #include <bits/stdc++.h>   using namespace std;   string solve1(string n) {     string res(n.length(),  9 );     for (char c =  8 ; c >=  0 ; c--) {       string t(n.length(), c);       if (t >= n) res = t;     }     return res;   }   string solve2(string n) {     string res = solve1(n);     for (char a =  0 ; a <=  9 ; a++)       for (char b = a + 1; b <=  9 ; b++) {         bool n_ok = true;         for (int i = 0; i < n.length(); i++) {           if (n[i] < b) {             string t = n;             if (t[i] < a)               t[i] = a;             else               t[i] = b;             for (int j = i + 1; j < n.length(); j++) t[j] = a;             if (res > t) res = t;           }           if (n[i] != a && n[i] != b) {             n_ok = false;             break;           }         }         if (n_ok) return n;       }     return res;   }   string solve() {     string n;     int k;     cin >> n >> k;     if (k == 1)       return solve1(n);     else       return solve2(n);   }   int main() {     int t;     cin >> t;     while (t--) cout << solve() <<   n ;     return 0;   }   