answer.code: In constructor ‘INT::INT()’:
answer.code:10:15: error: ‘memset’ was not declared in this scope
   10 |         len=1;memset(a,0,sizeof(a));
      |               ^~~~~~
answer.code:1:1: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
  +++ |+#include <cstring>
    1 | 
answer.code: In constructor ‘INT::INT(int)’:
answer.code:15:9: error: ‘memset’ was not declared in this scope
   15 |         memset(a,0,sizeof(a));
      |         ^~~~~~
answer.code:15:9: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
answer.code: In copy constructor ‘INT::INT(const INT&)’:
answer.code:25:9: error: ‘memset’ was not declared in this scope
   25 |         memset(a,0,sizeof(a));
      |         ^~~~~~
answer.code:25:9: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
answer.code: In member function ‘INT& INT::operator=(const INT&)’:
answer.code:32:9: error: ‘memset’ was not declared in this scope
   32 |         memset(a,0,sizeof(a));
      |         ^~~~~~
answer.code:32:9: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
answer.code: At global scope:
answer.code:135:1: error: ‘ostream’ does not name a type
  135 | ostream& operator<<(ostream& out,INT &b){
      | ^~~~~~~
answer.code:159:11: error: ‘pair’ does not name a type
  159 | #define P pair<int,int>
      |           ^~~~
answer.code:160:1: note: in expansion of macro ‘P’
  160 | P p[N];
      | ^
answer.code: In function ‘void solve()’:
answer.code:163:5: error: ‘cin’ was not declared in this scope
  163 |     cin>>n;
      |     ^~~
answer.code:1:1: note: ‘std::cin’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
  +++ |+#include <iostream>
    1 | 
answer.code:165:14: error: ‘p’ was not declared in this scope
  165 |         cin>>p[i].first>>p[i].second;
      |              ^
answer.code:167:10: error: ‘p’ was not declared in this scope
  167 |     sort(p+1,p+1+n);
      |          ^
answer.code:167:5: error: ‘sort’ was not declared in this scope; did you mean ‘short’?
  167 |     sort(p+1,p+1+n);
      |     ^~~~
      |     short
answer.code:170:5: error: ‘cout’ was not declared in this scope
  170 |     cout<<f[1].x<<" "<<f[1].y<<" "<<f[n].x<<" "<<f[n].y<<endl;
      |     ^~~~
answer.code:170:5: note: ‘std::cout’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
answer.code:170:58: error: ‘endl’ was not declared in this scope
  170 |     cout<<f[1].x<<" "<<f[1].y<<" "<<f[n].x<<" "<<f[n].y<<endl;
      |                                                          ^~~~
answer.code:1:1: note: ‘std::endl’ is defined in header ‘<ostream>’; did you forget to ‘#include <ostream>’?
  +++ |+#include <ostream>
    1 | 
answer.code: In function ‘int main()’:
answer.code:190:5: error: ‘cin’ was not declared in this scope
  190 |     cin>>T;
      |     ^~~
answer.code:190:5: note: ‘std::cin’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?