Language: C++

//#define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
//#include<cstdio>//"scanf("%lf",&(double型変数));printf("%f",(double型変数));"
using namespace std;
#define pb push_back
#define fi first
#define sc second
#define mp make_pair
typedef __int128 ll;
typedef pair<int,int> pii;

#define MAX_N 50

int main(){
	int n;
	ll a[MAX_N];
	scanf("%d",&n);
	for(int i=0;i<n;++i) cin>>a[i];
	vector<pii> v;
	int l=0,r=n;
	while(r-l>0){
		int k=l;
		for(int i=l+1;i<r;++i) if(abs(a[k])<abs(a[i])) k=i;
		if(a[k]==0) goto end;
		else if(a[k]<0){
			for(int i=k-1;i>=l;--i) for(;a[i]>a[i+1];a[i]+=a[i+1]) v.pb(mp(i+2,i+1));
			l=k+1;
		}else{
			for(int i=k+1;i<r;++i) for(;a[i-1]>a[i];a[i]+=a[i-1]) v.pb(mp(i,i+1));
			r=k-1;
		}
	}
	goto end;
	return 0;
end:
	printf("%d\n",v.size());
	for(int i=0;i<v.size();++i) printf("%d %d\n",v[i].fi,v[i].sc);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:33: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'll' {aka '__int128'})
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                              ~~~^~~~~~
      |                              |       |
      |                              |       ll {aka __int128}
      |                              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:2:
/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:18:38: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'short int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'unsigned int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'long int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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>]' (near match)
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:7: note:   conversion of argument 1 would be ill-formed:
a.cc:18:38: error: cannot bind non-const lvalue reference of type 'float&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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>]' (near match)
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:7: note:   conversion of argument 1 would be ill-formed:
a.cc:18:38: error: cannot bind non-const lvalue reference of type 'double&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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>]' (near match)
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:7: note:   conversion of argument 1 would be ill-formed:
a.cc:18:38: error: cannot bind non-const lvalue reference of type 'long double&' to a value of type 'll' {aka '__int128'}
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
/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:18:38: error: invalid conversion from 'll' {aka '__int128'} to 'void*' [-fpermissive]
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
      |                                      |
      |                                      ll {aka __int128}
a.cc:18:38: error: cannot bind rvalue '(void*)((long int)a[i])' 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:18:38: error: invalid conversion from 'll' {aka '__int128'} to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   18 |         for(int i=0;i<n;++i) cin>>a[i];
      |                                   ~~~^
      |                                      |
      |                                      ll {aka __int128}
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_is