#include<bits/stdc++.h>
using namespace std;
int s[1000000], a[1000000];
int main(){
    int n,m,ans;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        s[i]=s[i-1]+a[i];
    }
    while(m--){
        int x,y;
        scanf("%d%d",x,y);
        ans=s[y]-s[x-1];
        printf("%d/n",ans);
    }
    return 0;
}

/**************************************************************
	Problem: 2060
	User: linzihao
	Language: C++
	Result: Runtime Error
****************************************************************/