View Compilation Error

0_0_21410971_9766.cpp: In function 'int get_sg(int, int)':
0_0_21410971_9766.cpp:71:29: error: too few arguments to function 'int get_sg(int, int)'
         ret ^= (1 + get_sg(v));
                             ^
0_0_21410971_9766.cpp:66:5: note: declared here
 int get_sg(int u, int f) {
     ^