/* * 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 #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 #include #include namespace atcoder { template struct segtree { public: segtree() : segtree(0) {} explicit segtree(int n) : segtree(std::vector(n, e())) {} explicit segtree(const std::vector& v) : _n(int(v.size())) { log = internal::ceil_pow2(_n); size = 1 << log; d = std::vector(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 int max_right(int l) const { return max_right(l, [](S x) { return f(x); }); } template 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 int min_left(int r) const { return min_left(r, [](S x) { return f(x); }); } template 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 d; void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); } }; } // namespace atcoder #endif // ATCODER_SEGTREE_HPP #include using namespace std; using namespace atcoder; struct S { int left, cost, right; }; S e() { return {0, 0, 0}; } S op(S lhs, S rhs) { int middle = min(lhs.right, rhs.left); return {lhs.left + (rhs.left - middle), lhs.cost + (middle ? 1 : 0) + rhs.cost, (lhs.right - middle) + rhs.right}; } int main() { cin.tie(0)->sync_with_stdio(0); int n, q; cin >> n >> q; string s; cin >> s; vector a(n); for (int i = 0; i < n; ++i) { if (s[i] == '(') { a[i] = {0, 0, 1}; } else { a[i] = {1, 0, 0}; } } segtree seg(a); while (q--) { int tp; cin >> tp; if (tp == 1) { int i; cin >> i; --i; if (s[i] == '(') { s[i] = ')'; seg.set(i, {1, 0, 0}); } else { // s[i] == ')' s[i] = '('; seg.set(i, {0, 0, 1}); } } else { // tp == 2 int l, r; cin >> l >> r; --l, --r; cout << seg.prod(l, r + 1).cost << "\n"; } } return 0; }