#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")


// T: monoid representing information of an interval.
//   T()  should return the identity.
//   T(S s)  should represent a single element of the array.
//   T::pull(const T &l, const T &r)  should pull two intervals.
template <class T> struct SegmentTreePoint {
  int logN, n;
  vector<T> ts;
  SegmentTreePoint() : logN(0), n(0) {}
  explicit SegmentTreePoint(int n_) {
    for (logN = 0, n = 1; n < n_; ++logN, n <<= 1) {}
    ts.resize(n << 1);
  }
  template <class S> explicit SegmentTreePoint(const vector<S> &ss) {
    const int n_ = ss.size();
    for (logN = 0, n = 1; n < n_; ++logN, n <<= 1) {}
    ts.resize(n << 1);
    for (int i = 0; i < n_; ++i) at(i) = T(ss[i]);
    build();
  }
  T &at(int i) {
    return ts[n + i];
  }
  void build() {
    for (int u = n; --u; ) pull(u);
  }

  inline void pull(int u) {
    ts[u].pull(ts[u << 1], ts[u << 1 | 1]);
  }

  // Changes the value of point a to s.
  template <class S> void change(int a, const S &s) {
    assert(0 <= a); assert(a < n);
    ts[a += n] = T(s);
    for (; a >>= 1; ) pull(a);
  }

  // Applies T::f(args...) to point a.
  template <class F, class... Args>
  void ch(int a, F f, Args &&... args) {
    assert(0 <= a); assert(a < n);
    (ts[a += n].*f)(args...);
    for (; a >>= 1; ) pull(a);
  }

  // Calculates the product for [a, b).
  T get(int a, int b) {
    assert(0 <= a); assert(a <= b); assert(b <= n);
    if (a == b) return T();
    a += n; b += n;
    T prodL, prodR, t;
    for (int aa = a, bb = b; aa < bb; aa >>= 1, bb >>= 1) {
      if (aa & 1) { t.pull(prodL, ts[aa++]); prodL = t; }
      if (bb & 1) { t.pull(ts[--bb], prodR); prodR = t; }
    }
    t.pull(prodL, prodR);
    return t;
  }

  // Calculates T::f(args...) of a monoid type for [a, b).
  //   op(-, -)  should calculate the product.
  //   e()  should return the identity.
  template <class Op, class E, class F, class... Args>
#if __cplusplus >= 201402L
  auto
#else
  decltype((std::declval<T>().*F())())
#endif
  get(int a, int b, Op op, E e, F f, Args &&... args) {
    assert(0 <= a); assert(a <= b); assert(b <= n);
    if (a == b) return e();
    a += n; b += n;
    auto prodL = e(), prodR = e();
    for (int aa = a, bb = b; aa < bb; aa >>= 1, bb >>= 1) {
      if (aa & 1) prodL = op(prodL, (ts[aa++].*f)(args...));
      if (bb & 1) prodR = op((ts[--bb].*f)(args...), prodR);
    }
    return op(prodL, prodR);
  }

  // Find min b s.t. T::f(args...) returns true,
  // when called for the partition of [a, b) from left to right.
  //   Returns n + 1 if there is no such b.
  template <class F, class... Args>
  int findRight(int a, F f, Args &&... args) {
    assert(0 <= a); assert(a <= n);
    if ((T().*f)(args...)) return a;
    if (a == n) return n + 1;
    a += n;
    for (; ; a >>= 1) if (a & 1) {
      if ((ts[a].*f)(args...)) {
        for (; a < n; ) {
          if (!(ts[a <<= 1].*f)(args...)) ++a;
        }
        return a - n + 1;
      }
      ++a;
      if (!(a & (a - 1))) return n + 1;
    }
  }

  // Find max a s.t. T::f(args...) returns true,
  // when called for the partition of [a, b) from right to left.
  //   Returns -1 if there is no such a.
  template <class F, class... Args>
  int findLeft(int b, F f, Args &&... args) {
    assert(0 <= b); assert(b <= n);
    if ((T().*f)(args...)) return b;
    if (b == 0) return -1;
    b += n;
    for (; ; b >>= 1) if ((b & 1) || b == 2) {
      if ((ts[b - 1].*f)(args...)) {
        for (; b <= n; ) {
          if (!(ts[(b <<= 1) - 1].*f)(args...)) --b;
        }
        return b - n - 1;
      }
      --b;
      if (!(b & (b - 1))) return -1;
    }
  }
};

////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////

constexpr int INF = 1001001001;

struct NodeMin {
  int mn;
  NodeMin() : mn(+INF) {}
  NodeMin(int val) : mn(val) {}
  void pull(const NodeMin &l, const NodeMin &r) {
    mn = min(l.mn, r.mn);
  }
  void ch(int val) {
    mn = val;
  }
  void chmin(int val) {
    if (mn > val) mn = val;
  }
  bool test(int tar) const {
    return (mn <= tar);
  }
};
struct NodeMax {
  int mx;
  NodeMax() : mx(-INF) {}
  NodeMax(int val) : mx(val) {}
  void pull(const NodeMax &l, const NodeMax &r) {
    mx = max(l.mx, r.mx);
  }
  void ch(int val) {
    mx = val;
  }
  void chmax(int val) {
    if (mx < val) mx = val;
  }
  bool test(int tar) const {
    return (mx >= tar);
  }
};

////////////////////////////////////////////////////////////////////////////////


// zs[i] := lcp(as[0, n), as[i, n))
// 0    i-j     j     i
// |-------|    |-------|    zs[j]
// |---| |---|  |---| |---|  zs[i-j]
template <class T> void suffixZ(const T *as, int n, int *zs) {
  if (n == 0) return;
  zs[0] = 0;
  for (int j = 0, i = 1; i < n; ++i) {
    if (i + zs[i - j] < j + zs[j]) {
      zs[i] = zs[i - j];
    } else {
      int &z = zs[i] = max(j + zs[j] - i, 0);
      for (; i + z < n && as[z] == as[i + z]; ++z) {}
      j = i;
    }
  }
  zs[0] = n;
}
template <class T> vector<int> suffixZ(const T &as) {
  vector<int> zs(as.size());
  suffixZ(as.data(), as.size(), zs.data());
  return zs;
}

////////////////////////////////////////////////////////////////////////////////


char buf[150'010];

int N, Q;
string S, T;
vector<Int> W;
vector<int> L, R;

int main() {
  for (; ~scanf("%d%d", &N, &Q); ) {
    scanf("%s", buf); S = buf;
    scanf("%s", buf); T = buf;
    W.resize(N);
    for (int i = 0; i < N; ++i) {
      scanf("%lld", &W[i]);
    }
    L.resize(Q);
    R.resize(Q);
    for (int q = 0; q < Q; ++q) {
      scanf("%d%d", &L[q], &R[q]);
      --L[q];
    }
    
    vector<Int> WSum(N + 1, 0);
    for (int i = 0; i < N; ++i) {
      WSum[i + 1] = WSum[i] + W[i];
    }
    
    vector<int> fail(N + 1);
    {
      int j = fail[0] = -1;
      for (int i = 0; i < N; ++i) {
        for (; ~j && S[j] != S[i]; j = fail[j]) {}
        fail[i + 1] = ++j;
      }
    }
// cerr<<"fail = "<<fail<<endl;
    vector<Int> dp(N + 1, 0);
    for (int i = 1; i <= N; ++i) {
      dp[i] = dp[fail[i]] + W[i - 1];
    }
// cerr<<"dp = "<<dp<<endl;
    for (int i = 1; i <= N; ++i) {
      dp[i] += dp[i - 1];
    }
    
    const auto zs = suffixZ(S + T);
    vector<int> rs(N + 1);
    for (int i = 0; i < N; ++i) {
      rs[i] = i + zs[N + i];
    }
    rs[N] = N;
// cerr<<"zs = "<<zs<<", rs = "<<rs<<endl;
    SegmentTreePoint<NodeMax> seg(rs);
    
    vector<Int> fs(N + 1, 0);
    for (int i = 0; i < N; ++i) {
      fs[i + 1] = fs[i] + WSum[zs[N + i]];
    }
    
    for (int q = 0; q < Q; ++q) {
      // T[pos, R[q]): prefix of S
      int pos = seg.findRight(L[q], &NodeMax::test, R[q]) - 1;
// cerr<<L[q]<<" "<<R[q]<<" "<<T.substr(L[q],R[q]-L[q])<<": pos = "<<pos<<endl;
      assert(L[q] <= pos); assert(pos <= R[q]);
      Int ans = 0;
      ans += (fs[pos] - fs[L[q]]);
      ans += dp[R[q] - pos];
      printf("%lld\n", ans);
    }
  }
  return 0;
}