View Compilation Error

0_0_18022505_21011.cpp:19:2: error: stray '\' in program
  /\node a,next;
  ^
0_0_18022505_21011.cpp: In function 'int bfs(int)':
0_0_18022505_21011.cpp:19:2: error: expected primary-expression before '/' token
0_0_18022505_21011.cpp:19:9: error: expected primary-expression before 'a'
  /\node a,next;
         ^