/in/foo.cc: In function 'int spfa()':
/in/foo.cc:35:5: error: 'queue' was not declared in this scope
     queue<Lux> q;
     ^~~~~
/in/foo.cc:35:14: error: expected primary-expression before '>' token
     queue<Lux> q;
              ^
/in/foo.cc:35:16: error: 'q' was not declared in this scope
     queue<Lux> q;
                ^
/in/foo.cc:31:18: warning: unused variable 'temp' [-Wunused-variable]
     int i, u, v, temp;
                  ^~~~