View Compilation Error

0_0_18019078_10648.cpp:55:5: error: stray '\' in program
     /\node[v]=top++;
     ^
0_0_18019078_10648.cpp: In function 'void add_side(int, int, int, int)':
0_0_18019078_10648.cpp:55:5: error: expected primary-expression before '/' token