#include<iostream>
#include<cmath>
#include<cstring>
#include<string>
#include<cstdio>
#include<algorithm>
#include<stack>
#include<queue>
#include<iomanip>
using namespace std;

int n,m;
int a[100002],s[100002];

int main(){
	cin >> n;
	for(int i=1;i<=n;i++){
		scanf("%d",&a[i]);
	}
	s[0] = 0;
	for(int i=1;i<=n;i++){
		s[i] = s[i-1] + a[i]; 
	}
	cin >> m;
	int l,r;
	for(int i=1;i<=m;i++){
		scanf("%d %d",&l,&r);
		printf("%d\n",s[r] - s[l-1]);				
	}		
	return 0;
}

https://www.luogu.com.cn/record/list?pid=B3612&user=1163332

#include <bits/stdc++.h>
using namespace std;
inline int read()
{
	int x=0,f=1;char ch=getchar();
	while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}
	while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
	return x*f;
}
int n,m,a[100050],s[100050];
int main()
{
	n=read();
	for (int i=1;i<=n;i++)
		s[i]=s[i-1]+(a[i]=read());
	m=read();
	for (int i=1;i<=m;i++)
	{
		int l=read(),r=read();
		cout << s[r]-s[l-1] << endl;
	}
	return 0;
}