#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
typedef long long int ll;
using namespace std;
#define INF 1234567890
#define LIMIT 1

int arr[100005];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n, m;
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		cin >> arr[i];
		arr[i] += arr[i - 1];
	}
	for (int i = 1; i <= m; i++) {
		int a, b;
		cin >> a >> b;
		if (a > b) swap(a, b);
		cout << arr[b] - arr[a - 1] << "\n";
	}
	
	return 0;
}