Järjestys

input/code.cpp: In function 'int main()':
input/code.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(j >= a.size()) {
                   ^
input/code.cpp:91:11: error: cannot bind 'std::ostream {aka std::basic_ostream<char>}' lvalue to 'std::basic_ostream<char>&&'
   cout << op << " ";
           ^
In file included from /usr/include/c++/4.8/istream:39:0,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from input/code.cpp:7:
/usr/include/c++/4.8/ostream:602:5: error:   initializing argument 1 of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::vector<int>]'
     operator<<(basic_ostream<_CharT, _Traits>&...

//#include <iostream>
//#include <string>
//#include <algorithm>
//#include <vector>
 
#include <bits/stdc++.h>
 
using namespace std;
 
 
int main() {
	
	int n;
	cin >> n;
	
//	string op;
//	op = "";
	
	int h;
	h = 0;
	
	int x[n];
	
	vector<int> a;
	
	vector<int> op;
	
	for(int i = 0; i < n; i++) {
	
		int o;
		cin >> o;
		
		a.push_back(o);
		x[o - 1] = i;
		
	}
	
	
	
	for(int i = n; i > 1; i--) {
	
		for(int j = x[i - 1]; j >= 0; j--) {
			
//			j = min(j, a.size() - 1);
			
			if(j >= a.size()) {
				j = a.size();
			} 
			
			if(a[j] == i && j != (i - 1)) {
				
				if(j + 1 > 1) {
					op.push_back(j + 1);
					h++;
				}
				
				if(i > 1) {
					op.push_back(i);
					h++;
				}
				
				if(i - 1 > 1) {
					op.push_back(i - 1);
					h++;
				}
				
				if(j > 1) {
					op.push_back(j);
					h++;
				}
 
				a.erase(a.begin() + j);
				break;
				
			}
			
		}
		
	}
 
	cout << h;
	cout << "\n";
	
//	for(int i = 0; i < op.size(); i++) {
//		cout << op[i];
//		cout << " ";
//	}
 
	for(int i : op)
		cout << op << " ";
	
	cout << "\n";
 
	return 0;
}