Submission #1315491

#	Time	Username	Problem	Language	Result	Execution time	Memory
1315491		m.zeeshanrashid	Horses (IOI15_horses)	C++20	Compilation error	0 ms	0 KiB

horses

// #ifdef __AVX2__
// #pragma GCC target "avx2"
// #endif
// #pragma GCC optimize "O3"
// #pragma GCC optimize "unroll-loops"
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp> 
// #include <ext/pb_ds/tree_policy.hpp> 
// using namespace __gnu_pbds; 
using namespace std;
// #define int long long
#define elif else if
#define all(l) begin(l),end(l)
#define rall(l) rbegin(l),rend(l)
#define append push_back
#define print(l) for(auto i:l) cout<<i<<' '; cout<<endl;
#define pprint(a,b) cout<<a<<' '<<b<<endl;
#define inp(l) for(auto &i:l) cin>>i;
// #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define pai make_pair
#define endl "\n"
#define pii pair<int,int>
#define fi first
#define se second
#define vec vector

// const int mod=998244353;
const int mod1=998244353;
const int mod=1e9+7;
const int MA=5e5+5;

#define ll long long

ll n;
ll x[MA],y[MA];

struct node{
	ll ma,mu1,li,ri;
	node* ch[2];
	node(){
		ma=0;
		mu1=1;
		ch[0]=ch[1]=NULL;
	}
	void init(int l,int r){
		li=l;
		ri=r;
	}
	void set(int i,int v){
		if(li==ri){
			ma=mu1=v;
			return;
		}
		int m=(li+ri)/2;
		ma=0;
		mu1=1;
		if(i<=m){
			if(ch[0]==NULL){
				ch[0]=new node;
				ch[0]->init(li,m);
			}
			ch[0]->set(i,v);
		}
		else{
			if(ch[1]==NULL){
				ch[1]=new node;
				ch[1]->init(m+1,ri);
			}
			ch[1]->set(i,v);
		}
		if(ch[0]!=NULL){
			ma=(*ch[0]).ma;
			mu1=(*ch[0]).mu1;
		}
		if(ch[1]!=NULL){
			ma=max(ma,(*ch[1]).ma);
			mu1=(((*ch[1]).mu1)*mu1)%mod;
		}
	}
	int mx(int l,int r){
		if(l<=li and ri<=r) return ma;
		int x=0;
		int m=(li+ri)/2;
		if(l<=m) x=ch[0]->mx(l,r);
		if(r>m) x=max(x,ch[1]->mx(l,r));
		return x;
	}
	ll mul(int l,int r){
		if(r<li or l>ri) return 1;
		if(l<=li and ri<=r) return mu1;
		ll x=1;
		int m=(li+ri)/2;
		if(l<=m) x=ch[0]->mul(l,r);
		if(r>m) x=(x*ch[1]->mul(l,r));
		return x%mod;
	}
};

node ry;
node rx;

unordered_set<pii>seg;

#define int1 __int128

int i1=-1;

int ans(){
	deque<pii>a;
	int1 tem=1;
	while(tem<1e9){
		pii b=*(seg.rbegin());
		a.push_front(b);
		seg.erase(b);
		tem*=x[b.fi];
	}
	int1 intem=tem;
	// return tem;
	int1 ma=0,ans1=0;
	// int1 ma=1;
	// return tem;
	// if(i1==10){
		// cout<<"a\n";
		// for(auto [x,y]:a){
			// cout<<x<<' '<<y<<endl;
		// }
		// cout<<"a\n";
	// }
	if(a[0].fi==0){
		tem/=x[0];
		intem/=x[0];
		if(tem<1e9){
			ans1=ry.mx(1,n);
		}
		seg.insert(a[0]);
		a.pop_front();
	}
	if(a.empty()){
		return ry.mx(1,n);
	}
	// if(i1==10){
		// cout<<"a1\n";
		// for(auto [x,y]:a){
			// cout<<x<<' '<<y<<endl;
		// }
		// cout<<"a1\n";
	// }
	// return tem;
	tem=1;
	// if(i1==10)
	// cout<<"a1\n";
	// if(i1==10){
	// int1 temp=1;
	// cout<<x[9]<<' '<<x[10]<<endl;
	// temp*=x[9];
	// temp*=x[10];
	// temp*=2;
	// temp*=100000;
	// cout<<(long long)(temp/(1e18))<<' '<<(long long)(temp%(long long)1e18)<<endl;
	// cout<<(long long)(temp%((long long)1e9+7))<<endl;
	// }
	for(int i=0;i<a.size();i++){
		pii b=a[i];
		tem*=x[b.fi];
		ma=max(ma,tem*(int1)ry.mx(b.fi,b.se));
		// if(i1==10 and b==a.back()){
			// cout<<ry.mx(b.fi,b.se)<<endl;
			// int1 temp=ma;
			// cout<<(long long)(temp/(1e18))<<' '<<(long long)(temp%(long long)1e18)<<endl;
		// }
		// if(i1==10){
			// int1 g=tem*ry.mx(b.fi,b.se);
			// // cout<<i<<' '<<(ll)tem<<' ';
			// int1 x1=1e18;
			// cout<<(ll)(g/x1)<<(ll)(g%x1)<<endl;
		// }
	}
	// if(i1==10)
	// cout<<"a1\n";
	// return tem;
	for(auto i:a){
		seg.insert(i);
	}
	ma*=rx.mul(1,a[0].fi-1);
	if(intem<1e9){
		ma=max(ma,ans1);
	}
	ma%=mod;
	return ma;
}

int updateX(int i,int v){
	i++;
	i1=i;
	int pr=x[i];
	x[i]=v;
	rx.set(i,v);
	if(pr>1 and v>1) return ans();
	if(pr==v) return ans();
	if(v==1){
		auto p=seg.lower_bound(pai(i,0));
		auto p1=p;
		p1--;
		pii a=*p,b=*p1;
		seg.erase(a);
		seg.erase(b);
		seg.insert(pai(b.fi,a.se));
	}
	else{
		auto p=seg.lower_bound(pai(i,0));
		p--;
		pii a=*p;
		seg.erase(a);
		seg.insert(pai(a.fi,i-1));
		seg.insert(pai(i,a.se));
	}
	return ans();
}

int updateY(int i,int v){
	i++;
	ry.set(i,v);
	y[i]=v;
	return ans();
}

int init(int N,int X[],int Y[]){
	n=N;
	ry.init(0,n+5);
	rx.init(0,n+5);
	x[0]=1e9;
	for(int i=1;i<=n;i++){
		x[i]=X[i-1];
		rx.set(i,x[i]);
		y[i]=Y[i-1];
		ry.set(i,y[i]);
	}
	int l,r;
	l=r=0;
	for(int i=1;i<=n;i++){
		if(x[i]>1){
			seg.insert(pai(l,r));
			l=r=i;
		}
		else
			r++;
	}
	seg.insert(pai(l,r));
	int1 tem=1;
	// for(auto pa:seg){
		// tem*=x[pa.fi];
		// cout<<x[pa.fi]<<' '<<pa.fi<<' '<<pa.se<<endl;
	// }
	// cout<<(ll)tem<<endl;
	return ans();
	// return 0;
}

Compilation message (stderr)

horses.cpp:102:19: error: use of deleted function 'std::unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set() [with _Value = std::pair<int, int>; _Hash = std::hash<std::pair<int, int> >; _Pred = std::equal_to<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]'
  102 | unordered_set<pii>seg;
      |                   ^~~
In file included from /usr/include/c++/13/unordered_set:41,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:189,
                 from horses.cpp:6:
/usr/include/c++/13/bits/unordered_set.h:142:7: note: 'std::unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set() [with _Value = std::pair<int, int>; _Hash = std::hash<std::pair<int, int> >; _Pred = std::equal_to<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]' is implicitly deleted because the default definition would be ill-formed:
  142 |       unordered_set() = default;
      |       ^~~~~~~~~~~~~
/usr/include/c++/13/bits/unordered_set.h:142:7: error: use of deleted function 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_Hashtable() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>]'
In file included from /usr/include/c++/13/bits/unordered_map.h:33,
                 from /usr/include/c++/13/unordered_map:41,
                 from /usr/include/c++/13/functional:63,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:53:
/usr/include/c++/13/bits/hashtable.h:530:7: note: 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_Hashtable() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>]' is implicitly deleted because the default definition would be ill-formed:
  530 |       _Hashtable() = default;
      |       ^~~~~~~~~~
/usr/include/c++/13/bits/hashtable.h:530:7: error: use of deleted function 'std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _Traits>::_Hashtable_base() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, true, true>]'
In file included from /usr/include/c++/13/bits/hashtable.h:35:
/usr/include/c++/13/bits/hashtable_policy.h:1701:7: note: 'std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _Traits>::_Hashtable_base() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, true, true>]' is implicitly deleted because the default definition would be ill-formed:
 1701 |       _Hashtable_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1701:7: error: use of deleted function 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::_Hash_code_base() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _ExtractKey = std::__detail::_Identity; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; bool __cache_hash_code = true]'
/usr/include/c++/13/bits/hashtable_policy.h: In instantiation of 'std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<std::pair<int, int> >]':
/usr/include/c++/13/bits/hashtable_policy.h:1301:7:   required from here
/usr/include/c++/13/bits/hashtable_policy.h:1218:49: error: use of deleted function 'std::hash<std::pair<int, int> >::hash()'
 1218 |       _Hashtable_ebo_helper() noexcept(noexcept(_Tp())) : _Tp() { }
      |                                                 ^~~~~
In file included from /usr/include/c++/13/string_view:42,
                 from /usr/include/c++/13/bits/basic_string.h:47,
                 from /usr/include/c++/13/string:54,
                 from /usr/include/c++/13/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:52:
/usr/include/c++/13/bits/functional_hash.h:102:12: note: 'std::hash<std::pair<int, int> >::hash()' is implicitly deleted because the default definition would be ill-formed:
  102 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/13/bits/functional_hash.h:102:12: error: no matching function for call to 'std::__hash_enum<std::pair<int, int>, false>::__hash_enum()'
/usr/include/c++/13/bits/functional_hash.h:83:7: note: candidate: 'std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = std::pair<int, int>; bool <anonymous> = false]'
   83 |       __hash_enum(__hash_enum&&);
      |       ^~~~~~~~~~~
/usr/include/c++/13/bits/functional_hash.h:83:7: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/13/bits/functional_hash.h:102:12: error: 'std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = std::pair<int, int>; bool <anonymous> = false]' is private within this context
  102 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/13/bits/functional_hash.h:84:7: note: declared private here
   84 |       ~__hash_enum();
      |       ^
/usr/include/c++/13/bits/hashtable_policy.h:1301:7: note: 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::_Hash_code_base() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _ExtractKey = std::__detail::_Identity; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; bool __cache_hash_code = true]' is implicitly deleted because the default definition would be ill-formed:
 1301 |       _Hash_code_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1301:7: error: use of deleted function 'std::__detail::_Hashtable_ebo_helper<1, std::hash<std::pair<int, int> >, true>::~_Hashtable_ebo_helper()'
/usr/include/c++/13/bits/hashtable_policy.h:1215:12: note: 'std::__detail::_Hashtable_ebo_helper<1, std::hash<std::pair<int, int> >, true>::~_Hashtable_ebo_helper()' is implicitly deleted because the default definition would be ill-formed:
 1215 |     struct _Hashtable_ebo_helper<_Nm, _Tp, true>
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1215:12: error: use of deleted function 'std::hash<std::pair<int, int> >::~hash()'
/usr/include/c++/13/bits/functional_hash.h:102:12: note: 'std::hash<std::pair<int, int> >::~hash()' is implicitly deleted because the default definition would be ill-formed:
  102 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/13/bits/functional_hash.h:102:12: error: 'std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = std::pair<int, int>; bool <anonymous> = false]' is private within this context
/usr/include/c++/13/bits/functional_hash.h:84:7: note: declared private here
   84 |       ~__hash_enum();
      |       ^
/usr/include/c++/13/bits/hashtable_policy.h:1701:7: error: use of deleted function 'std::__detail::_Hash_code_base<std::pair<int, int>, std::pair<int, int>, std::__detail::_Identity, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()'
 1701 |       _Hashtable_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1279:12: note: 'std::__detail::_Hash_code_base<std::pair<int, int>, std::pair<int, int>, std::__detail::_Identity, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()' is implicitly deleted because the default definition would be ill-formed:
 1279 |     struct _Hash_code_base
      |            ^~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1279:12: error: use of deleted function 'std::__detail::_Hashtable_ebo_helper<1, std::hash<std::pair<int, int> >, true>::~_Hashtable_ebo_helper()'
/usr/include/c++/13/bits/hashtable.h:530:7: error: use of deleted function 'std::__detail::_Hashtable_base<std::pair<int, int>, std::pair<int, int>, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, true, true> >::~_Hashtable_base()'
  530 |       _Hashtable() = default;
      |       ^~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1658:12: note: 'std::__detail::_Hashtable_base<std::pair<int, int>, std::pair<int, int>, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, true, true> >::~_Hashtable_base()' is implicitly deleted because the default definition would be ill-formed:
 1658 |     struct _Hashtable_base
      |            ^~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1658:12: error: use of deleted function 'std::__detail::_Hash_code_base<std::pair<int, int>, std::pair<int, int>, std::__detail::_Identity, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()'
/usr/include/c++/13/bits/hashtable.h:530:7: error: use of deleted function 'constexpr std::_Enable_default_constructor<false, _Tag>::_Enable_default_constructor() [with _Tag = std::__detail::_Hash_node_base]'
  530 |       _Hashtable() = default;
      |       ^~~~~~~~~~
In file included from /usr/include/c++/13/bits/hashtable.h:36:
/usr/include/c++/13/bits/enable_special_members.h:113:15: note: declared here
  113 |     constexpr _Enable_default_constructor() noexcept = delete;
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp: In function 'int ans()':
horses.cpp:112:29: error: 'class std::unordered_set<std::pair<int, int> >' has no member named 'rbegin'; did you mean 'begin'?
  112 |                 pii b=*(seg.rbegin());
      |                             ^~~~~~
      |                             begin
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:201:28: error: 'class std::unordered_set<std::pair<int, int> >' has no member named 'lower_bound'
  201 |                 auto p=seg.lower_bound(pai(i,0));
      |                            ^~~~~~~~~~~
horses.cpp:206:27: error: 'b' was not declared in this scope
  206 |                 seg.erase(b);
      |                           ^
horses.cpp:210:28: error: 'class std::unordered_set<std::pair<int, int> >' has no member named 'lower_bound'
  210 |                 auto p=seg.lower_bound(pai(i,0));
      |                            ^~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h: In instantiation of 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::__hash_code std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::_M_hash_code(const _Key&) const [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _ExtractKey = std::__detail::_Identity; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; bool __cache_hash_code = true; __hash_code = long unsigned int]':
/usr/include/c++/13/bits/hashtable.h:2384:43:   required from 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::size_type std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_M_erase(std::true_type, const key_type&) [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>; size_type = long unsigned int; std::true_type = std::integral_constant<bool, true>; key_type = std::pair<int, int>]'
/usr/include/c++/13/bits/hashtable.h:984:24:   required from 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::size_type std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::erase(const key_type&) [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>; size_type = long unsigned int; key_type = std::pair<int, int>]'
/usr/include/c++/13/bits/unordered_set.h:553:26:   required from 'std::unordered_set<_Value, _Hash, _Pred, _Alloc>::size_type std::unordered_set<_Value, _Hash, _Pred, _Alloc>::erase(const key_type&) [with _Value = std::pair<int, int>; _Hash = std::hash<std::pair<int, int> >; _Pred = std::equal_to<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; size_type = long unsigned int; key_type = std::pair<int, int>]'
horses.cpp:114:12:   required from here
/usr/include/c++/13/bits/hashtable_policy.h:1308:23: error: static assertion failed: hash function must be invocable with an argument of key type
 1308 |         static_assert(__is_invocable<const _Hash&, const _Key&>{},
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1308:23: note: 'std::__is_invocable<const std::hash<std::pair<int, int> >&, const std::pair<int, int>&>()' evaluates to false
/usr/include/c++/13/bits/hashtable_policy.h:1310:25: error: no match for call to '(const std::hash<std::pair<int, int> >) (const std::pair<int, int>&)'
 1310 |         return _M_hash()(__k);
      |                ~~~~~~~~~^~~~~
/usr/include/c++/13/bits/hashtable_policy.h: In instantiation of 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::__hash_code std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHash, _Unused, __cache_hash_code>::_M_hash_code_tr(const _Kt&) const [with _Kt = std::pair<int, int>; _Key = std::pair<int, int>; _Value = std::pair<int, int>; _ExtractKey = std::__detail::_Identity; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; bool __cache_hash_code = true; __hash_code = long unsigned int]':
/usr/include/c++/13/bits/hashtable.h:2264:44:   required from 'std::pair<typename std::__detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::iterator, bool> std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_M_insert_unique(_Kt&&, _Arg&&, const _NodeGenerator&) [with _Kt = const std::pair<int, int>&; _Arg = const std::pair<int, int>&; _NodeGenerator = std::__detail::_AllocNode<std::allocator<std::__detail::_Hash_node<std::pair<int, int>, true> > >; _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>; typename std::__detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::iterator = std::__detail::_Insert_base<std::pair<int, int>, std::pair<int, int>, std::allocator<std::pair<int, int> >, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >::iterator; typename _Traits::__constant_iterators = std::__detail::_Hashtable_traits<true, true, true>::__constant_iterators]'
/usr/include/c++/13/bits/hashtable.h:904:27:   required from 'std::pair<typename std::__detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::iterator, bool> std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_M_insert_unique_aux(_Arg&&, const _NodeGenerator&) [with _Arg = const std::pair<int, int>&; _NodeGenerator = std::__detail::_AllocNode<std::allocator<std::__detail::_Hash_node<std::pair<int, int>, true> > >; _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>; typename std::__detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::iterator = std::__detail::_Insert_base<std::pair<int, int>, std::pair<int, int>, std::allocator<std::pair<int, int> >, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >::iterator; typename _Traits::__constant_iterators = std::__detail::_Hashtable_traits<true, true, true>::__constant_iterators]'
/usr/include/c++/13/bits/hashtable.h:916:31:   required from 'std::pair<typename std::__detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::iterator, bool> std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::_M_insert(_Arg&&, const _NodeGenerator&, std::true_type) [with _Arg = const std::pair<int, int>&; _NodeGenerator = std::__detail::_AllocNode<std::allocator<std::__detail::_Hash_node<std::pair<int, int>, true> > >; _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>; typename std::__detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::iterator = std::__detail::_Insert_base<std::pair<int, int>, std::pair<int, int>, std::allocator<std::pair<int, int> >, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >::iterator; typename _Traits::__constant_iterators = std::__detail::_Hashtable_traits<true, true, true>::__constant_iterators; std::true_type = std::integral_constant<bool, true>]'
/usr/include/c++/13/bits/hashtable_policy.h:933:22:   required from 'std::__detail::_Insert_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::__ireturn_type std::__detail::_Insert_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::insert(const value_type&) [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>; __ireturn_type = std::__detail::_Insert_base<std::pair<int, int>, std::pair<int, int>, std::allocator<std::pair<int, int> >, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >::__ireturn_type; value_type = std::pair<int, int>]'
/usr/include/c++/13/bits/unordered_set.h:429:27:   required from 'std::pair<typename std::_Hashtable<_Value, _Value, _Alloc, std::__detail::_Identity, _Pred, _Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<std::__not_<std::__and_<std::__is_fast_hash<_Hash>, std::__is_nothrow_invocable<const _Hash&, const _Tp&> > >::value, true, true> >::iterator, bool> std::unordered_set<_Value, _Hash, _Pred, _Alloc>::insert(const value_type&) [with _Value = std::pair<int, int>; _Hash = std::hash<std::pair<int, int> >; _Pred = std::equal_to<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; typename std::_Hashtable<_Value, _Value, _Alloc, std::__detail::_Identity, _Pred, _Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<std::__not_<std::__and_<std::__is_fast_hash<_Hash>, std::__is_nothrow_invocable<const _Hash&, const _Tp&> > >::value, true, true> >::iterator = std::__detail::_Insert_base<std::pair<int, int>, std::pair<int, int>, std::allocator<std::pair<int, int> >, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >::iterator; value_type = std::pair<int, int>]'
horses.cpp:135:13:   required from here
/usr/include/c++/13/bits/hashtable_policy.h:1317:25: error: static assertion failed: hash function must be invocable with an argument of key type
 1317 |           static_assert(__is_invocable<const _Hash&, const _Kt&>{},
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/hashtable_policy.h:1317:25: note: 'std::__is_invocable<const std::hash<std::pair<int, int> >&, const std::pair<int, int>&>()' evaluates to false
/usr/include/c++/13/bits/hashtable_policy.h:1319:27: error: no match for call to '(const std::hash<std::pair<int, int> >) (const std::pair<int, int>&)'
 1319 |           return _M_hash()(__k);
      |                  ~~~~~~~~~^~~~~
/usr/include/c++/13/bits/hashtable.h: In instantiation of 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = std::pair<int, int>; _Value = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; _ExtractKey = std::__detail::_Identity; _Equal = std::equal_to<std::pair<int, int> >; _Hash = std::hash<std::pair<int, int> >; _RangeHash = std::__detail::_Mod_range_hashing; _Unused = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, true, true>]':
/usr/include/c++/13/bits/unordered_set.h:104:11:   required from here
/usr/include/c++/13/bits/hashtable.h:1610:5: error: use of deleted function 'std::__detail::_Hashtable_base<std::pair<int, int>, std::pair<int, int>, std::__detail::_Identity, std::equal_to<std::pair<int, int> >, std::hash<std::pair<int, int> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, true, true> >::~_Hashtable_base()'
 1610 |     }
      |     ^