dango3.cpp: In function 'void Solve(int, int)':
dango3.cpp:23:25: error: 'rng' was not declared in this scope
23 | shuffle(a+1,a+cur_n+1,rng);
| ^~~
dango3.cpp:30:7: error: 'class std::vector<int>' has no member named 'pb'
30 | ans.pb(a[1]);
| ^~
dango3.cpp:39:61: error: 'class std::vector<int>' has no member named 'pb'
39 | for (i=1;i<cur_n+1;i++) if (!taken[i] and i!=id) query_v.pb(a[i]);
| ^~
dango3.cpp:46:9: error: 'class std::vector<int>' has no member named 'pb'
46 | ans.pb(a[id]);
| ^~
dango3.cpp:59:27: error: 'class std::vector<int>' has no member named 'pb'
59 | for (auto u:s) final_ans.pb(u);
| ^~