#include<iostream>
#include<random>
#include<algorithm>
#include<numeric>
using namespace std;
 
struct Example {
	int num;
	int num2;
};
 
int main(){
	const int number = 100;
	vector<Example> data;
 
	random_device seed_gen;
	mt19937 engine(seed_gen());
	uniform_real_distribution<> dist1(-100.0, 100.0);
 
	for(int i=0; i<number; i++){
		//data.emplace_back(Example{(int)dist1(engine), (int)dist1(engine)});
		data.emplace_back(Example{i, i});
	}
 
	//check
	for_each(data.begin(), data.end(), 
		[](auto d){
			cout << d.num << " " << d.num2 << ", ";
		}
	);
	cout << endl;
 
	const int sum = accumulate(data.begin()+50, data.begin()+56+1, 0,
		[](int acc, auto d){
			return acc + d.num;
		}
	);
 
	cout << sum << endl;
 
	return 0;
}
 

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