View Code of Problem 3939

#include<stdio.h>
void main(){
  int n,q;
  while(scanf("%d%d",&n,&q)!=EOF){
    int l,r,a[100010];
    a[0]=0;
    for(int i=1;i<=n;i++){
      scanf("%d",&a[i]);
      a[i]+=a[i-1];
    }
    while(q--){
      scanf("%d%d",&l,&r);
      printf("%d\n",a[r]-a[l-1]);
    }
  }
}