View Compilation Error

0_0_29566360_11734.cpp: In function 'll Directed_MST(int, int, int)':
0_0_29566360_11734.cpp:43:34: error: 'memset' was not declared in this scope
         memset(id, -1, sizeof(id));
                                  ^
0_0_29566360_11734.cpp: In function 'int main()':
0_0_29566360_11734.cpp:86:15: error: 'scanf' was not declared in this scope
  scanf("%d",&T);
               ^
0_0_29566360_11734.cpp:100:53: error: 'printf' was not declared in this scope
   printf("%d %d\n",(-ans+n-1)/n,(-ans+n-1)/n*n+ans+1);
                                                     ^