#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;

// 答え, )の個数,(の個数
using S = tuple<int,int,int>;
constexpr S op(S lhs, S rhs){
	auto [Lcnt, LL, LR] = lhs;
	auto [Rcnt, RL, RR] = rhs;
	int mn = min(LR, RL);
	// cerr << Lcnt + Rcnt + 2 * mn << " " << LL + RL - mn << " " << LR + RR - mn << endl;
	return make_tuple(Lcnt + Rcnt + 2 * mn, LL + RL - mn, LR + RR - mn);
}
constexpr S e(){return make_tuple(0, 0, 0);}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, q;
	cin >> n >> q;
	vector<S> tmp(n);
	string s;
	cin >> s;
	for(int i = 0; i < n; i++){
		if(s[i] == '(') get<2>(tmp[i]) = 1;
		else get<1>(tmp[i]) = 1;
	}
	atcoder::segtree<S, op, e> seg(tmp);
	cerr << "\n";
	while(q--){
		int cmd;
		cin >> cmd;
		if(cmd == 1){
			int p, v;
			cin >> p >> v;
			p--;
			if(v == 2) seg.set(p, make_tuple(0, 1, 0));
			else seg.set(p, make_tuple(0, 0, 1));
		}else{
			int l, r;
			cin >> l >> r;
			cout << get<0>(seg.prod(l - 1, r)) << '\n';
		}
	}
}