View Compilation Error

0_0_19216149_22466.cpp: In function 'int main()':
0_0_19216149_22466.cpp:73:31: error: 'scanf' was not declared in this scope
  while(scanf("%d%d%d",&n,&t,&m)!=EOF)
                               ^
0_0_19216149_22466.cpp:73:34: error: 'EOF' was not declared in this scope
  while(scanf("%d%d%d",&n,&t,&m)!=EOF)
                                  ^
0_0_19216149_22466.cpp:110:22: error: 'printf' was not declared in this scope
     printf("%d\n",sum);
                      ^