#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll z=10000000;
int d=10;
ll op(ll a,ll b){return((a/z+b/z+b%z/d*(a%d)+(a%d+b%d)/d)*z+d*(a%z/d+b%z/d)+(a%d+b%d)%9);}
int main(){
  ll n,q;cin>>n>>q;
  vector<ll>s(1<<20,0);
  s[0]=1<<19;
  for(ll i=0;i<n;i++){
  	ll a;cin>>a;
  	if(a==9)a=z+d;
  	else a+=d;
  	s[s[0]+i+1]=a;
  }
  for(ll i=s[0]-1;i>0;i--)s[i]=op(s[i*2],s[i*2+1]);
  for(ll i=0;i<q;i++){
    ll pt,l,r=0,t=0;cin>>pt>>l;l++;
    while(pt<l){
      while(pt%(2<<t)==0)t++;
      while(pt+(1<<t)>=l&&t>=1)t--;
      r=op(r,s[(pt+s[0])>>t]);
      pt+=1<<t;
    }
    cout<<r/z<<endl;
  }
}