View Compilation Error

0_0_30903701_32626.cpp: In function 'int Find(int, int*, int*)':
0_0_30903701_32626.cpp:12:28: error: too few arguments to function 'int Find(int, int*, int*)'
         int t = Find(pre[x]);
                            ^
0_0_30903701_32626.cpp:6:5: note: declared here
 int Find(int x, int *pre, int *under)
     ^
0_0_30903701_32626.cpp: In function 'void join(int, int, int*, int*, int*)':
0_0_30903701_32626.cpp:21:19: error: too few arguments to function 'int Find(int, int*, int*)'
     int a = Find(x), b = Find(y);
                   ^
0_0_30903701_32626.cpp:6:5: note: declared here
 int Find(int x, int *pre, int *under)
     ^
0_0_30903701_32626.cpp:22:14: error: 'b' was not declared in this scope
     if (a != b)
              ^