Language: C++

#define _USE_MATH_DEFINES
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <cfloat>
#include <ctime>
#include <cassert>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <numeric>
#include <list>


#ifdef _DEBUG
#define typeof(X) std::identity<decltype(X)>::type //C++0x (for vs2010)
#else
#define typeof(X) __typeof__(X) // for gcc
#endif

using namespace std;
static const double EPS = 1e-6;
typedef long long ll;
const int MODULO = 1000000007;
const int INF = 100000000; //1e8

typedef long long ll;
typedef pair<int,int> Pii;
typedef pair<ll,ll> Pll;
typedef complex<double> Cd;


double _x1,_x2,_x3,_x4,y1,y2,y3,y4;

bool solve()
{
	if(_x2 < _x3 || _x4 < _x1){
		return false;
	} else if(y2 < y3 || y4 < y1){
		return false;
	}

	return true;
}

int main(){
	while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
		cout << (solve() ? "YES" : "NO") << endl;
	}
	return 0;
}

Compiler output:
a.cc:44:24: error: 'double y1' redeclared as different kind of entity
   44 | double _x1,_x2,_x3,_x4,y1,y2,y3,y4;
      |                        ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/cstdio:41,
                 from a.cc:2:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'bool solve()':
a.cc:50:33: error: invalid operands of types 'double' and 'double(double) noexcept' to binary 'operator<'
   50 |         } else if(y2 < y3 || y4 < y1){
      |                              ~~ ^ ~~
      |                              |    |
      |                              |    double(double) noexcept
      |                              double
a.cc: In function 'int main()':
a.cc:58:23: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |               ~~~~~~~~^~~~
      |                  |      |
      |                  |      double(double) noexcept
      |                  std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:13:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(short int)y1' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(short unsigned int)y1' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(int)y1' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(unsigned int)y1' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(long int)y1' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(long unsigned int)y1' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(long long unsigned int)y1' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |                         double (*)(double) noexcept
a.cc:58:25: error: cannot bind rvalue '(void*)y1' to 'void*&'
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:58:25: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   58 |         while(cin>>_x1>>y1>>_x2>>y2>>_x3>>y3>>_x4>>y4){
      |                         ^~
      |                         |
      |