View Code of Problem 3939

#include<iostream>
using namespace std;
int main(){
	int n,q;
	int a[100010];
	while(cin>>n>>q){
		for(int i=1;i<=n;i++){
			cin>>a[i];
		}
		while(q--){
			int l,r;
			cin>>l>>r;
			long long sum=0;
			for(int i=l;i<=r;i++){
				sum+=a[i];
			}
			cout<<sum<<endl;
		}
	}
}