Language: C++

#include <bits/stdc++.h>
#define N 100050
#define x first
#define y second
using namespace std;
typedef pair<int,int> pii;
inline int rd() {
	int x=0,f=1;char ch=getchar();
	while (ch>'9'||ch<'0') {if(ch=='-')f=-1;ch=getchar();}
	while (ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+ch-'0';ch=getchar();}
	return x*f;
}

int r,c,n,x1[N],x2[N],y1[N],y2[N],tot;
pii p[N];
inline int get(int x1,int y1) {
	if (!x1) return y1;
	if (y1==c) return r+x1;
	if (x1==r) return r+c+r-y1;
	return 2*r+c+c-x1;
}

bool fz(int x1,int y1) {
	return x1==0 || x1==r || y1==0 || y1==c;
}

int main() {
	r = rd(), c = rd(), n = rd();

	for (int i=1;i<=n;i++) x1[i] = rd(), y1[i] = rd(), x2[i] = rd(), y2[i] = rd();
	for (int i=1;i<=n;i++)
		if (fz(x1[i],y1[i]) && fz(x2[i],y2[i]))
			p[++tot] = pii(get(x1[i],y1[i]), get(x2[i],y2[i]));
	for (int i=1;i<=tot;i++) if (p[i].x > p[i].y) swap(p[i].x, p[i].y);
	
	sort(p+1,p+tot+1);

	int flag = 1;
	for (int i=1;i<tot;i++) if (p[i].y < p[i+1].y) flag = 0;
	puts(flag ? "YES" : "NO");
	return 0;
}


Compiler output:
a.cc:14:27: error: 'int y1 [100050]' redeclared as different kind of entity
   14 | int r,c,n,x1[N],x2[N],y1[N],y2[N],tot;
      |                           ^
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/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:33,
                 from a.cc:1:
/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 'int main()':
a.cc:30:50: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   30 |         for (int i=1;i<=n;i++) x1[i] = rd(), y1[i] = rd(), x2[i] = rd(), y2[i] = rd();
      |                                                  ^
a.cc:30:52: error: assignment of read-only location '*(y1 + ((sizetype)i))'
   30 |         for (int i=1;i<=n;i++) x1[i] = rd(), y1[i] = rd(), x2[i] = rd(), y2[i] = rd();
      |                                              ~~~~~~^~~~~~
a.cc:32:34: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   32 |                 if (fz(x1[i],y1[i]) && fz(x2[i],y2[i]))
      |                                  ^
a.cc:32:34: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   32 |                 if (fz(x1[i],y1[i]) && fz(x2[i],y2[i]))
      |                              ~~~~^
      |                                  |
      |                                  double (*)(double) noexcept
a.cc:23:20: note:   initializing argument 2 of 'bool fz(int, int)'
   23 | bool fz(int x1,int y1) {
      |                ~~~~^~
a.cc:33:54: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   33 |                         p[++tot] = pii(get(x1[i],y1[i]), get(x2[i],y2[i]));
      |                                                      ^
a.cc:33:43: error: no matching function for call to 'get(int&, double (&)(double) noexcept)'
   33 |                         p[++tot] = pii(get(x1[i],y1[i]), get(x2[i],y2[i]));
      |                                        ~~~^~~~~~~~~~~~~
a.cc:16:12: note: candidate: 'int get(int, int)' (near match)
   16 | inline int get(int x1,int y1) {
      |            ^~~
a.cc:16:12: note:   conversion of argument 2 would be ill-formed:
a.cc:33:54: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   33 |                         p[++tot] = pii(get(x1[i],y1[i]), get(x2[i],y2[i]));
      |                                                  ~~~~^
      |                                                      |
      |                                                      double (*)(double) noexcept
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1250:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type& std::get(pair<_Tp1, _Tp2>&)'
 1250 |     get(pair<_Tp1, _Tp2>& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1250:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1255:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&& std::get(pair<_Tp1, _Tp2>&&)'
 1255 |     get(pair<_Tp1, _Tp2>&& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1255:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1260:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr const typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type& std::get(const pair<_Tp1, _Tp2>&)'
 1260 |     get(const pair<_Tp1, _Tp2>& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1260:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1265:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr const typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&& std::get(const pair<_Tp1, _Tp2>&&)'
 1265 |     get(const pair<_Tp1, _Tp2>&& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1265:5: note:   candidate expects 1 argument, 2 provided
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/tuple:2445:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >& std::get(tuple<_Elements ...>&)'
 2445 |     get(tuple<_Elements...>& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2445:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/tuple:2451:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >& std::get(const tuple<_Elements ...>&)'
 2451 |     get(const tuple<_Elements...>& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2451:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/tuple:2457:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >&& std::get(tuple<_Elements ...>&&)'
 2457 |     get(tuple<_Elements...>&& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2457:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/tuple:2466:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >&& std::get(const tuple<_Elements ...>&&)'
 2466 |     get(const tuple<_Elements...>&& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2466:5: note:   candidate expects 1 argument, 2 provided
In file included from /usr/include/c++/14/functional:65,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/array:390:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr _Tp& std::get(array<_Tp, _Nm>&)'
  390 |     get(array<_Tp, _Nm>& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:390:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/array:399:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr _Tp&& std::get(array<_Tp, _Nm>&&)'
  399 |     get(array<_Tp, _Nm>&& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:399:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/array:408:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr const _Tp& std::get(const array<_Tp, _Nm>&)'
  408 |     get(const array<_Tp, _Nm>& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:408:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/array:417:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr const _Tp&& std::get(const array<_Tp, _Nm>&&)'
  417 |     get(const array<_Tp, _Nm>&& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:417:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1272:5: note: candidate: 'template<class _Tp, class _Up> constexpr _Tp& std::get(pair<_T1, _T2>&)'
 1272 |     get(pair<_Tp, _Up>& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1272:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1277:5: note: candidate: 'template<class _Tp, class _Up> constexpr const _Tp& std::get(const pair<_T1, _T2>&)'
 1277 |     get(const pair<_Tp, _Up>& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1277:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1282:5: note: candidate: 'template<class _Tp, class _Up> constexpr _Tp&& std::get(pair<_T1, _T2>&&)'
 1282 |     get(pair<_Tp, _Up>&& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1282:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1287:5: note: candidate: 'template<class _Tp, class _Up> constexpr const _Tp&& std::get(const pair<_T1, _T2>&&)'
 1287 |     get(const pair<_Tp, _Up>&& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1287:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1292:5: note: candidate: 'template<class _Tp, class _Up> constexpr _Tp& std::get(pair<_Up, _Tp>&)'
 1292 |     get(pair<_Up, _Tp>& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1292:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1297:5: note: candidate: 'template<class _Tp, class _Up> constexpr const _Tp& std::get(const pair<_Up, _Tp>&)'
 1297 |     get(const pair<_Up, _Tp>& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1297:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1302:5: note: candidate: 'template<class _Tp, class _Up> constexpr _Tp&& std::get(pair<_Up, _Tp>&&)'
 1302 |     get(pair<_Up, _Tp>&& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1302:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_pair.h:1307:5: note: candidate: 'template<class _Tp, class _Up> constexpr const _Tp&& std::get(const pair<_Up, _Tp>&&)'
 1307 |     get(const pair<_Up, _Tp>&& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1307:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/tuple:2476:5: note: candidate: 'template<long unsigned int