#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template<class T>T op(T a,T b){
	return((a/10000000+b/10000000+b%10000000/10*(a%10)+(a%10+b%10)/10)*10000000+10*(a%10000000/10+b%10000000/10)+(a%10+b%10)%9);
}
template<class T,T(*op)(T,T)>void segmake(vector<T> &seg){
  for(T i=seg[0]-1;i>0;i--){
    seg[i]=op(seg[i*2],seg[i*2+1]);
  }return;
}
template<class T,T(*op)(T,T)>T segprod(int begin,int end,T empty,vector<T> &seg){
  T ret=empty,bit=0,pt=begin;
  while(pt<end){
    while(pt%(2<<bit)==0)bit++;
    while(pt+(1<<bit)>=end&&bit>=1)bit--;
    ret=op(ret,seg[(pt+seg[0])>>bit]);
    pt+=1<<bit;
  }return ret;
}
int main(){
  int n,q;cin>>n>>q;
  vector<ll>s(1<<20,0);
  s[0]=1<<19;
  for(int i=0;i<n;i++){
  	ll a;cin>>a;
  	if(a==9)a=10000010;
  	if(a==1)a=11;
  	if(a==0)a=10;
  	s[s[0]+i+1]=a;
  }
  segmake<ll,op>(s);
  for(int i=0;i<q;i++){
    int f,e;cin>>f>>e;
    cout<<segprod<ll,op>(f,e+1,0,s)/10/1000000<<endl;
  }
}