来自可莉厨的尖锐叫声(开溜！！！)

#include<iostream>
using namespace std;
const int N=1e5+5;
int DUDUKE[N];
int HONGLONG[N];
int main(){
    int ILOVEKELI,IloveU;
    cin>>ILOVEKELI>>IloveU;
    for(int BENG=1;BENG<=ILOVEKELI;BENG++){
        cin>>DUDUKE[BENG];
    }
    HONGLONG[1]=DUDUKE[1];
    for(int BENG=2;BENG<=ILOVEKELI;BENG++){
        HONGLONG[BENG]=HONGLONG[BENG-1]+DUDUKE[BENG];
    }
    for(int BENG=1;BENG<=IloveU;BENG++){
        int HUOHUA,QISHI;
        cin>>HUOHUA>>QISHI;
        cout<<HONGLONG[QISHI]-HONGLONG[HUOHUA-1]<<endl;
    }
}