Envío 559

Código

#include <iostream>
#include <vector>
using namespace std;

int main(void)
{
	long lenght, a, sum = 0, p, q;
	cin >> lenght;

	vector<int> arr(lenght);

	for (long i = 0; i < lenght; i++)
	{
		cin >> a;
		sum += a;
		arr[i] = sum;
	}

	cin >> lenght;
	for (long i = 0; i < lenght; i++)
	{
		cin >> p;
		cin >> q;
		sum = arr[q];

		if (p > 0)
			sum  = arr[q] - arr[p - 1];

		cout << sum << endl;
	}

	return 0;
}