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#include <bits/stdc++.h>
#include <math.h>
using namespace std;
#define endl "\n"
#define mp make_pair
#define st first
#define nd second
#define pii pair<int, int>
#define pb push_back
#define _upgrade ios_base::sync_with_stdio(0), cout.setf(ios::fixed), cout.precision(10), cin.tie(0), cout.tie(0);
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define fwd(i, a, b) for (int i = (a); i < (b); ++i)
#define trav(a, x) for (auto &a : x)
#define all(c) (c).begin(), (c).end()
#define sz(X) (int)((X).size())
typedef long double ld;
typedef unsigned long long ull;
typedef long long ll;
// mt19937_64 gen(2137);uniform_int_distribution<int> distr(0, 1e9);auto my_rand = bind(distr, gen); // my_rand() zwraca teraz liczbe z przedzialu [a, b]
#ifdef LOCAL
ostream &operator<<(ostream &out, string str) {
   for (char c : str)
      out << c;
   return out;
}
template <class L, class R> ostream &operator<<(ostream &out, pair<L, R> p) { return out << "(" << p.st << ", " << p.nd << ")"; }
template <class L, class R, class S> ostream &operator<<(ostream &out, tuple<L, R, S> p) {
   auto &[a, b, c] = p;
   return out << "(" << a << ", " << b << ", " << c << ")";
}
template <class T> auto operator<<(ostream &out, T a) -> decltype(a.begin(), out) {
   out << '{';
   for (auto it = a.begin(); it != a.end(); it = next(it))
      out << (it != a.begin() ? ", " : "") << *it;
   return out << '}';
}
void dump() { cerr << "\n"; }
template <class T, class... Ts> void dump(T a, Ts... x) {
   cerr << a << ", ";
   dump(x...);
}
#define debug(...) cerr << "[" #__VA_ARGS__ "]: ", dump(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define int long long
#define max(a, b) a > b ? a : b;

namespace SOL {

   const int S = 31;

   void get(vector<int> &K, vector<int> &O, int k, int s) {
      int n = sz(K);
      int rs = min(k + s - 1, n);

      rep(i, rs) K[i] = 0;
      for (int i = rs; i < n; i++)
         K[i] = O[i];
      for (int i = rs + 1; i < n; i++)
         K[i] = max(K[i - 1], K[i] + K[i - k]);
   }

   pii get(int idx, int k) { return {idx / k, idx % k}; }

   bool is(int idx, int k) {
      auto [a, b] = get(idx, k);
      return idx < 100 || a % S == S - 1 || b % S == S - 1 || (b == k - 1 && S < k);
   }

   void add_front(pii p, deque<pii> &D) {
      auto [x1, v1] = p;
      if (D.size()) {
         auto &[x2, v2] = D.front();
         if (x1 == x2) {
            v2 = max(v1, v2);
            return;
         }
      }
      D.push_front(p);
   }

   void add_back(pii p, deque<pii> &D) {
      auto [x1, v1] = p;
      if (D.size()) {
         auto &[x2, v2] = D.back();
         if (x1 == x2) {
            v2 = max(v1, v2);
            return;
         }
      }
      D.push_back(p);
   }

   vector<int> solve(vector<int> &A, vector<pii> &Q, int k) {
      int n = sz(A);
      int q = sz(Q);

      vector<int> K(n);
      vector<int> V(n);
      K[k - 1] = accumulate(A.begin(), A.begin() + k, 0ll);
      for (int i = k; i < n; i++)
         K[i] = K[i - 1] + A[i] - A[i - k];
      for (auto &k : K)
         k = max(0ll, k);

      vector<bool> G(n);
      rep(i, n) G[i] = is(i, k);

      vector<vector<pii>> QQ(n);
      vector<int> res(q);

      rep(i, q) {
         auto [a, b] = Q[i];
         deque<pii> D = {{a, 0}};

         while (!D.empty()) {
            auto [x, v] = D.front();
            D.pop_front();

            res[i] = max(res[i], v);

            if (x > b)
               continue;

            if (G[x])
               QQ[x].push_back({i, v});
            else {
               add_front({x + 1, v}, D);
               if (x + k - 1 <= b)
                  add_back({x + k, v + K[x + k - 1]}, D);
            }
         }
      }

      rep(i, n) if (G[i]) {
         get(V, K, k, i);
         for (auto [j, v] : QQ[i]) {
            auto [_, b] = Q[j];
            res[j] = max(res[j], V[b] + v);
         }
      }

      return res;
   }
} // namespace SOL

int32_t main() {
   _upgrade;

   int n, k, q;
   cin >> n >> k >> q;
   vector<int> A(n);
   rep(i, n) cin >> A[i];
   vector<pii> Q(q);
   for (auto &[a, b] : Q)
      cin >> a >> b;

   for (auto &[a, b] : Q)
      --a, --b;

   auto res = SOL::solve(A, Q, k);
   for (auto a : res)
      cout << a << endl;
}