func_code_string: #include <bits/stdc++.h>   using namespace std;      using ll = long long int;   typedef vector<ll> vi;   typedef vector<vi> vvi;   typedef pair<ll,ll> ii;   typedef vector<ii> vii;   typedef vector<vii> vvii;   #define F first   #define S second      ll min(ll x, ll y){       return ((x < y) ? x : y);   }      ll max(ll x, ll y){       return ((x > y) ? x : y);   }   const ll INF = 1e18;      double findavg (ll x, ll itr){       ll sum = 0;       for (ll i = 0; itr > i; i++){           ll mvs = 0;           ll cur = 0;           while (x > cur){               ll rd = rand()%2;               if (rd){                   cur++;               }else cur = 0;               mvs++;           }           cout << mvs << endl;           sum += mvs;       }       double ans = (double)sum/(double)itr;       cout <<  x:   << x <<     <<  itr:   << itr << endl;       cout << ans << endl;       return ans;   }      int main(){       ll t; cin >> t;       while (t--){           ll k; cin >> k;           if (k%2 == 1){               cout <<  -1 n ;               continue;           }           vi v;           for (ll i = 1; 63 > i; i++){               ll bm = 1;               bm <<= i;               if (k & bm){                   v.push_back(1);                   for (ll j = 0; i > j+1; j++){                       if (j) v.push_back(0);                       else v.push_back(1);                   }               }              }           cout << v.size() << endl;           for (auto i: v) cout << i <<    ;           cout << endl;       }      }      