View Compilation Error

0_0_17013062_31215.cpp: In function 'int main()':
0_0_17013062_31215.cpp:6:39: error: 'scanf' was not declared in this scope
     while(scanf("%d%d%d%d",&n,&m,&k,&s)!=EOF)
                                       ^
0_0_17013062_31215.cpp:6:42: error: 'EOF' was not declared in this scope
     while(scanf("%d%d%d%d",&n,&m,&k,&s)!=EOF)
                                          ^
0_0_17013062_31215.cpp:15:56: error: 'max' was not declared in this scope
                 f[j][p]=max(f[j][p],f[j-b[i]][p-1]+a[i])10
                                                        ^
0_0_17013062_31215.cpp:22:40: error: 'printf' was not declared in this scope
                       printf("%d\n",m-i);
                                        ^
0_0_17013062_31215.cpp:27:22: error: 'printf' was not declared in this scope
         printf("-1\n");
                      ^