View Compilation Error

0_0_31532241_11304.cpp: In function 'int main()':
0_0_31532241_11304.cpp:6:30: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d",&n,&m))
                              ^
0_0_31532241_11304.cpp:8:29: error: 'memset' was not declared in this scope
         memset(p,0,sizeof(p));
                             ^
0_0_31532241_11304.cpp:18:37: error: 'printf' was not declared in this scope
                 printf("%d",i-500000);
                                     ^