View Compilation Error

0_0_17890417_10106.cpp:1:2: error: expected unqualified-id before '<' token
  <bits/stdc++.h>
  ^
0_0_17890417_10106.cpp: In member function 'void Point::Read()':
0_0_17890417_10106.cpp:18:23: error: 'scanf' was not declared in this scope
   scanf("%d%d", &x, &y);
                       ^
0_0_17890417_10106.cpp: In function 'int main()':
0_0_17890417_10106.cpp:82:23: error: 'scanf' was not declared in this scope
  while(~scanf("%d", &n)) {
                       ^
0_0_17890417_10106.cpp:91:19: error: 'sort' was not declared in this scope
    sort(p, p + tot);
                   ^
0_0_17890417_10106.cpp:95:25: error: 'printf' was not declared in this scope
   printf("%d\n", ans / 3);
                         ^