View Compilation Error

0_0_13991206_10737.cpp: In function 'void LCA(int)':
0_0_13991206_10737.cpp:44:34: error: 'union_set' was not declared in this scope
             union_set(x.first,u,0);
                                  ^
0_0_13991206_10737.cpp: In function 'int main()':
0_0_13991206_10737.cpp:64:26: error: too few arguments to function 'void union_set(int, int, int)'
             union_set(u,v);
                          ^
0_0_13991206_10737.cpp:48:6: note: declared here
 void union_set(int x,int y,int k){
      ^