Language: C++

#include<bits/stdc++.h>
using namespace std;
long long f[2000000],n[2000000];
long long p=1000000007;
long long mi(long long x,long long y,long long c)
{
	long long ans=1;
	while(y)
	{
		if(y&1) ans=ans*x%c;
		x=x*x%c;
		y>>=1;
	}
	return ans;
}
long long mo(int x,int y)
{
	if(x==y||y==0)
	{
		return 1;
	}
	return ((f[x]%p*n[y]%p)%p*n[x-y]%p)%p;
}
int main(){
	f[1]=1;
	for(int i=2;i<=200000;i++)
	{
		f[i]=(f[i-1]%p*i)%p;
	}
	n[200000]=mi(f[200000],p-2);
	for(int i=199999;i>=1;i--)
	{
		n[i]=(n[i+1]%p*(i+1)%p)%p;
	}
	cin>>n>>m>>a>>b;
	for(int i=1;i<=n-a;i++)
	{
		ans+=()
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:21: error: too few arguments to function 'long long int mi(long long int, long long int, long long int)'
   30 |         n[200000]=mi(f[200000],p-2);
      |                   ~~^~~~~~~~~~~~~~~
a.cc:5:11: note: declared here
    5 | long long mi(long long x,long long y,long long c)
      |           ^~
a.cc:35:12: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'long long int [2000000]')
   35 |         cin>>n>>m>>a>>b;
      |         ~~~^~~
      |         |    |
      |         |    long long int [2000000]
      |         std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/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:35:14: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'long long int*'
   35 |         cin>>n>>m>>a>>b;
      |              ^
/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:35:14: error: invalid conversion from 'long long int*' to 'short int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(short int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'short unsigned int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(short unsigned int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'unsigned int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(unsigned int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'long int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(long int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'long unsigned int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(long unsigned int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'long long int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(long long int)((long long int*)(& n))' 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:35:14: error: invalid conversion from 'long long int*' to 'long long unsigned int' [-fpermissive]
   35 |         cin>>n>>m>>a>>b;
      |              ^
      |              |
      |              long long int*
a.cc:35:14: error: cannot bind rvalue '(long long unsigned int)((long long int*)(& n))' 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:35:14: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   35 |         cin>>n>>m>>a>>b;
      |              ^
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'long long int [2000000]' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'long long int [2000000]' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'long long int [2000000]' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/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>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'long long int [2000000]' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))