View Compilation Error

0_0_39066887_7117.cpp: In member function 'void BFS::bfs()':
0_0_39066887_7117.cpp:249:33: error: 'assert' was not declared in this scope
  249 |                                 assert(0);
      |                                 ^~~~~~
0_0_39066887_7117.cpp:7:1: note: 'assert' is defined in header '<cassert>'; did you forget to '#include <cassert>'?
    6 | #include <set>
  +++ |+#include <cassert>
    7 |