func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int T = 1;     cin >> T;     while (T--) {       string s;       int x;       cin >> s >> x;       string ans;       int n = s.size();       for (int i = 0; i < n; i++) ans.push_back( 1 );       for (int i = 0; i < n; i++) {         if (s[i] ==  0 ) {           if (i - x >= 0) ans[i - x] =  0 ;           if (i + x < n) ans[i + x] =  0 ;         }       }       bool f = 1;       for (int i = 0; i < n; i++) {         if (s[i] ==  1 ) {           bool t = 0;           if (i + x < n && ans[i + x] ==  1 ) t = 1;           if (i - x >= 0 && ans[i - x] ==  1 ) t = 1;           if (!t) f = 0;         }       }       if (f)         cout << ans << endl;       else         cout <<  -1 n ;     }     return 0;   }   