View Compilation Error

0_0_16160745_2151.cpp: In function 'void fun()':
0_0_16160745_2151.cpp:23:24: error: 'printf' was not declared in this scope
     printf("%.0f\n",ans);
                        ^
0_0_16160745_2151.cpp: In function 'int main()':
0_0_16160745_2151.cpp:33:9: error: 'sf' was not declared in this scope
     sf(T);
         ^
0_0_16160745_2151.cpp:36:16: error: 'sf2' was not declared in this scope
         sf2(n,V);
                ^
0_0_16160745_2151.cpp:38:13: error: 'fr' was not declared in this scope
         fr(n) sf(node[i].a);
             ^
0_0_16160745_2151.cpp:46:18: error: 'pf' was not declared in this scope
             pf(-1);
                  ^
0_0_16160745_2151.cpp:49:29: error: 'sort' was not declared in this scope
         sort(node,node+n,cmp);
                             ^