Language: C++

#include<bits/stdc++.h>
#define int long long
using namespace std;
typedef pair<int,int> ii;
vector<ii> adj;
const long long mod=1000000007;
int fact[200000],invfact[200000],n,h,w,dp[200000],x,y;
int C(int k,int n)
{
	int ans=(invfact[k]%mod*invfact[n-k]%mod)%mod;
	return (ans*fact[n])%mod;
}
int binpow(int a,int n)
{
	if(n==1) return a;
	int tmp=binpow(a,n/2);
	if(n%2==0)
	{
		return ((tmp%mod)*(tmp%mod))%mod;
	}
	else
	{
		int ans=((tmp%mod)*(a%mod))%mod;
		return (ans*(tmp%mod))%mod;
	}
}
signed main()
{
	cin>>h>>w>>n;
	fact[0]=1;
	//invfact[0]=1;
	for(int i=1;i<=3000;i++) fact[i]=fact[i-1]%mod*i%mod,invfact[i]=binpow(fact[i],mod-2)%mod;
	for(int i=0;i<n;i++) 
	{
		cin>>x>>y;
		adj.push_back(ii(x,y));
	}
	sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
	adj.push_back(ii(h,w));
	for(int i=0;i<=n;i++)
	{
		dp[i]=C(adj[i].first-1,adj[i].first+adj[i].second-2)%mod;
		for(int j=0;j<i;j++)
		{
			if(adj[j].first<=adj[i].first&&adj[j].second<=adj[i].second)
			dp[i]=(dp[i]-dp[j]%mod*C(adj[i].first-adj[j].first,adj[i].first-adj[j].first+adj[i].second-adj[j].second)%mod+mod)%mod;
		}
	}
	cout<<dp[n];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:38:21: error: no match for 'operator+' (operand types are 'std::vector<std::pair<long long int, long long int> >' and 'long long int')
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                  ~~~^~
      |                  |   |
      |                  |   long long int
      |                  std::vector<std::pair<long long int, long long int> >
In file included from /usr/include/c++/14/bits/stl_algobase.h:67,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'long long int'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'long long int'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   'std::vector<std::pair<long long int, long long int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   mismatched types 'const _CharT*' and 'std::vector<std::pair<long long int, long long int> >'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'long long int'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   'std::vector<std::pair<long long int, long long int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   'std::vector<std::pair<long long int, long long int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   'std::vector<std::pair<long long int, long long int> >' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   'std::vector<std::pair<long long int, long long int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   'std::vector<std::pair<long long int, long long int> >' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3719:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3719 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   mismatched types 'const _CharT*' and 'std::vector<std::pair<long long int, long long int> >'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3726:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3726 |     operator+(_CharT __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note:   template argument deduction/substitution failed:
a.cc:38:22: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'long long int'
   38 |         sort(adj,adj+n,[](const Point& p, const Point& q) {if(p.first==q.first) return p.second<q.second; else return p.first<q.first;});
      |                      ^
/usr/include/c++/14/bits/basic_