前缀和

#include <bits/stdc++.h>

using namespace std;

const int N = 100010;

int a[N], pre[N];

int main(){
	int n;
	cin >> n;
	for(int i = 1; i <= n; i ++ ){
		cin >> a[i];
		// 前缀和数组 
		pre[i] = pre[i - 1] + a[i];
	}
	int m;
	cin >> m;
	while(m -- ){
		int l, r;
		cin >> l >> r;
		cout << pre[r] - pre[l - 1] << '\n'; 
	}
	return 0;
}