View Compilation Error

0_0_33305157_24922.cpp: In function 'node dfs(int, int, int)':
0_0_33305157_24922.cpp:50:41: error: expected ')' at end of input
   node cur=dfs(len-1,pre+digit(tmp),res.nxt
                                         ^
0_0_33305157_24922.cpp:50:41: error: expected ',' or ';' at end of input
0_0_33305157_24922.cpp:50:41: error: expected '}' at end of input
0_0_33305157_24922.cpp:50:41: error: expected '}' at end of input