View Compilation Error

0_0_18014144_6266.cpp:28:9: error: stray '\' in program
         dfs(x\num,y\num,step+1);
         ^
0_0_18014144_6266.cpp:28:9: error: stray '\' in program
0_0_18014144_6266.cpp: In function 'void dfs(LL, LL, LL)':
0_0_18014144_6266.cpp:28:15: error: expected ')' before 'num'
         dfs(x\num,y\num,step+1);
               ^
0_0_18014144_6266.cpp:28:21: error: expected ')' before 'num'
         dfs(x\num,y\num,step+1);
                     ^