foo.cc: In function 'void dfs(int, int)':
foo.cc:14:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   14 |     for (auto [y,z]:adj[x]){
      |               ^
foo.cc:15:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   15 |         if (y==f) continue; dfs(y,x);
      |         ^~
foo.cc:15:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   15 |         if (y==f) continue; dfs(y,x);
      |                             ^~~
foo.cc:19:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   19 |     for (auto [y,z]:adj[x]){
      |               ^
foo.cc: In function 'void solve()':
foo.cc:27:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   27 |     for (int i=1;i<=n;i++) adj[i].clear(); inv[1]=1;
      |     ^~~
foo.cc:27:44: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   27 |     for (int i=1;i<=n;i++) adj[i].clear(); inv[1]=1;
      |                                            ^~~
foo.cc:36:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   36 |     for (int i=1;i<=k;i++) vis[read()]=1; int coef=1;
      |     ^~~
foo.cc:36:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   36 |     for (int i=1;i<=k;i++) vis[read()]=1; int coef=1;
      |                                           ^~~
foo.cc: In function 'int main()':
foo.cc:44:9: warning: unused variable 'c' [-Wunused-variable]
   44 |     int c=read(),T=read();while (T--) solve();return 0;
      |         ^
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