View Compilation Error

0_0_32252651_18682.cpp: In function 'void marge(int, int, int)':
0_0_32252651_18682.cpp:25:15: error: invalid conversion from 'int (*)(int)' to 'int' [-fpermissive]
  u=find_root[u];
               ^
0_0_32252651_18682.cpp:26:15: error: invalid conversion from 'int (*)(int)' to 'int' [-fpermissive]
  v=find_root[v];
               ^