/*
 * Author: nskybytskyi
 * Time:   2022-01-07 14:20:00
 */

// https://github.com/atcoder/ac-library/blob/master/atcoder/internal_bit.hpp

#ifndef ATCODER_INTERNAL_BITOP_HPP
#define ATCODER_INTERNAL_BITOP_HPP 1

#ifdef _MSC_VER
#include <intrin.h>
#endif

namespace atcoder {

namespace internal {

// @param n `0 <= n`
// @return minimum non-negative `x` s.t. `n <= 2**x`
int ceil_pow2(int n) {
    int x = 0;
    while ((1U << x) < (unsigned int)(n)) x++;
    return x;
}

// @param n `1 <= n`
// @return minimum non-negative `x` s.t. `(n & (1 << x)) != 0`
constexpr int bsf_constexpr(unsigned int n) {
    int x = 0;
    while (!(n & (1 << x))) x++;
    return x;
}

// @param n `1 <= n`
// @return minimum non-negative `x` s.t. `(n & (1 << x)) != 0`
int bsf(unsigned int n) {
#ifdef _MSC_VER
    unsigned long index;
    _BitScanForward(&index, n);
    return index;
#else
    return __builtin_ctz(n);
#endif
}

}  // namespace internal

}  // namespace atcoder

#endif  // ATCODER_INTERNAL_BITOP_HPP

// https://github.com/atcoder/ac-library/blob/master/atcoder/segtree.hpp

#ifndef ATCODER_SEGTREE_HPP
#define ATCODER_SEGTREE_HPP 1

#include <algorithm>
#include <cassert>
#include <vector>

namespace atcoder {

template <class S, S (*op)(S, S), S (*e)()> struct segtree {
  public:
    segtree() : segtree(0) {}
    explicit segtree(int n) : segtree(std::vector<S>(n, e())) {}
    explicit segtree(const std::vector<S>& v) : _n(int(v.size())) {
        log = internal::ceil_pow2(_n);
        size = 1 << log;
        d = std::vector<S>(2 * size, e());
        for (int i = 0; i < _n; i++) d[size + i] = v[i];
        for (int i = size - 1; i >= 1; i--) {
            update(i);
        }
    }

    void set(int p, S x) {
        assert(0 <= p && p < _n);
        p += size;
        d[p] = x;
        for (int i = 1; i <= log; i++) update(p >> i);
    }

    S get(int p) const {
        assert(0 <= p && p < _n);
        return d[p + size];
    }

    S prod(int l, int r) const {
        assert(0 <= l && l <= r && r <= _n);
        S sml = e(), smr = e();
        l += size;
        r += size;

        while (l < r) {
            if (l & 1) sml = op(sml, d[l++]);
            if (r & 1) smr = op(d[--r], smr);
            l >>= 1;
            r >>= 1;
        }
        return op(sml, smr);
    }

    S all_prod() const { return d[1]; }

    template <bool (*f)(S)> int max_right(int l) const {
        return max_right(l, [](S x) { return f(x); });
    }
    template <class F> int max_right(int l, F f) const {
        assert(0 <= l && l <= _n);
        assert(f(e()));
        if (l == _n) return _n;
        l += size;
        S sm = e();
        do {
            while (l % 2 == 0) l >>= 1;
            if (!f(op(sm, d[l]))) {
                while (l < size) {
                    l = (2 * l);
                    if (f(op(sm, d[l]))) {
                        sm = op(sm, d[l]);
                        l++;
                    }
                }
                return l - size;
            }
            sm = op(sm, d[l]);
            l++;
        } while ((l & -l) != l);
        return _n;
    }

    template <bool (*f)(S)> int min_left(int r) const {
        return min_left(r, [](S x) { return f(x); });
    }
    template <class F> int min_left(int r, F f) const {
        assert(0 <= r && r <= _n);
        assert(f(e()));
        if (r == 0) return 0;
        r += size;
        S sm = e();
        do {
            r--;
            while (r > 1 && (r % 2)) r >>= 1;
            if (!f(op(d[r], sm))) {
                while (r < size) {
                    r = (2 * r + 1);
                    if (f(op(d[r], sm))) {
                        sm = op(d[r], sm);
                        r--;
                    }
                }
                return r + 1 - size;
            }
            sm = op(d[r], sm);
        } while ((r & -r) != r);
        return 0;
    }

  private:
    int _n, size, log;
    std::vector<S> d;

    void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); }
};

}  // namespace atcoder

#endif  // ATCODER_SEGTREE_HPP

#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;

struct S {
  bool ends_opening, starts_closing;
  int left, cost, right;
};

S e() { return {false, false, 0, 0, 0}; }

S op(S lhs, S rhs) {
  int middle = min(lhs.right, rhs.left);
  int left = lhs.left + (rhs.left - middle);
  int cost = lhs.cost + int(lhs.ends_opening && rhs.starts_closing) + rhs.cost;
  int right = (lhs.right - middle) + rhs.right;
  return {rhs.ends_opening, lhs.starts_closing, left, cost, right};
}

const S kOpening = {true, false, 0, 0, 1};
const S kClosing = {false, true, 1, 0, 0};

int main() {
  cin.tie(0)->sync_with_stdio(0);

  int n, q;
  cin >> n >> q;

  string s;
  cin >> s;

  vector<S> a(n);
  for (int i = 0; i < n; ++i) {
    if (s[i] == '(') {
      a[i] = kOpening;
    } else {  // s[i] == ')'
      a[i] = kClosing;
    }
  }

  segtree<S, op, e> seg(a);

  while (q--) {
    int tp;
    cin >> tp;

    if (tp == 1) {
      int i;
      cin >> i;
      --i;

      if (s[i] == '(') {
        s[i] = ')';
        seg.set(i, kClosing);
      } else {  // s[i] == ')'
        s[i] = '(';
        seg.set(i, kOpening);
      }
    } else {  // tp == 2
      int l, r;
      cin >> l >> r;
      --l, --r;

      cout << seg.prod(l, r + 1).cost << "\n";
    }
  }

  return 0;
}