View Compilation Error

0_0_39592721_19770.cpp: In function 'void build()':
0_0_39592721_19770.cpp:38:28: error: unable to deduce 'auto' from 'q.std::queue<int>::front'
   38 |                 auto u = q.front);
      |                          ~~^~~~~
0_0_39592721_19770.cpp:38:28: note:   couldn't deduce template parameter 'auto'
   38 |                 auto u = q.front);
      |                            ^~~~~
0_0_39592721_19770.cpp:38:33: error: expected ',' or ';' before ')' token
   38 |                 auto u = q.front);
      |                                 ^