View Compilation Error

0_0_16153979_20446.cpp: In function 'int main()':
0_0_16153979_20446.cpp:35:6: error: 'sf' was not declared in this scope
  sf(T);
      ^
0_0_16153979_20446.cpp:38:11: error: 'sf2' was not declared in this scope
   sf2(n, V);
           ^
0_0_16153979_20446.cpp:40:7: error: 'fr' was not declared in this scope
   fr(n) sf(node[i].a);
       ^
0_0_16153979_20446.cpp:48:9: error: 'pf' was not declared in this scope
    pf(-1);
         ^