#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

struct S {
  int r[9], s[9];
};

S op(S x, S y) {
  S z;
  rep(i, 9) {
    int j = x.r[i];
    z.r[i] = y.r[j];
    z.s[i] = x.s[i] + y.s[j];
  }
  return z;
}
S e() {
  S z;
  rep(i, 9) z.r[i] = i, z.s[i] = 0;
  return z;
}

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, q;
  cin >> n >> q;
  vector<S> init(n);
  rep(i, n) {
    int x;
    cin >> x;
    S s;
    rep(i, 9) {
      int v = 10 * i + x;
      int q = v / 9, r = v % 9;
      s.r[i] = r;
      s.s[i] = q;
    }
    init[i] = s;
  }
  segtree<S, op, e> seg(init);
  rep(_, q) {
    int l, r;
    cin >> l >> r;
    l--;
    cout << seg.prod(l, r).s[0] << '\n';
  }
}