View Compilation Error

0_0_39174879_24554.cpp: In constructor 'Solution::Solution()':
0_0_39174879_24554.cpp:7:20: error: 'cin' is not a member of 'std'
    7 |         while(std::cin >> n) {
      |                    ^~~
0_0_39174879_24554.cpp:2:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    1 | #include <cstdio>
  +++ |+#include <iostream>
    2 | 
0_0_39174879_24554.cpp:12:22: error: 'cin' is not a member of 'std'
   12 |                 std::cin >> val;
      |                      ^~~
0_0_39174879_24554.cpp:12:22: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?