ソースコード
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream>
#include <random>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define eps 0.000000001
#define LONG_INF 10000000000000000
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
long long hoge[10000000] = {};
int main() {
long long n;
cin >> n;
REP(i, n - 1) {
long long a;
cin >> a;
hoge[i + 1] = hoge[i] + a;
}
int q;
cin >> q;
REP(i, q) {
long long a, b;
cin >> a >> b;
cout << hoge[b - 1] - hoge[a - 1] << endl;
}
return 0;
}