#include<iostream>
#include<vector>
#include<cstdlib>
#include<algorithm>
using namespace std;
 
template<class T, class Pred>
vector<vector<T>> divide(const vector<T>& v, Pred pred)
{
	vector<vector<T>> ret;
	auto i = v.begin();
	for(;;) {
		auto j = adjacent_find(i, v.end(), pred);
		if (j == v.end())
			break;
		ret.emplace_back(i, j + 1);
		i = j + 1;
	}
	ret.emplace_back(i, v.end());
	return ret;
}
int main(void){
	vector<int> value = {1,4,7,8,11};
 
	auto ret = divide(value, [](int a, int b){return abs(b-a)>=2;});
 
	for( auto& a : ret ) {
		for( auto& b : a )
			cout << b << " ";
		cout << endl;
	}
 
	return 0;
}
 

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