View Code of Problem 3939

#include<iostream>
using namespace std;
int main(){
	int n,q;
	int a[100010];
	while(scanf("%d%d",&n,&q)!=EOF){
		for(int i=1;i<=n;i++){
			scanf("%d",&a[i]);
		}
		while(q--){
			int l,r;
			scanf("%d%d",&l,&r);
			long long sum=0;
			for(int i=l;i<=r;i++){
				sum+=a[i];
			}
			printf("%lld\n",sum);
		}
	}
}