from sys import stdin
n, q = [int(x) for x in stdin.readline().rstrip().split()]
s = stdin.readline().rstrip()
indata = list(map(int, stdin.read().split()))

bitree = [0 for i in range(n+1)]

def btadd(ind,x):
    global bitree
    while ind <= n:
        bitree[ind] += x
        ind += ind & (-ind)

def btsum(ind):
    val = 0
    while ind > 0:
        val += bitree[ind]
        ind -= ind & (-ind)
    return val

bracket = [0 for i in range(n)]
if s[0] == ")":
    bracket[0] = 0
for i in range(1,n):
    if s[i] == ")":
        bracket[i] = 1
        if bracket[i-1] == 0:
            btadd(i+1,1)

offset = 0
for i in range(q):
    a = indata[offset]
    if a == 1:
        x = indata[offset + 1] - 1
        offset += 2
        if bracket[x] == 0:
            if x < n-1:
                if bracket[x+1] == 1:
                    btadd(x+2,-1)
            if x > 0:
                if bracket[x-1] == 0:
                    btadd(x+1,1)
            bracket[x] = 1
        else:
            if x < n-1:
                if bracket[x+1] == 1:
                    btadd(x+2,1)
            if x > 0:
                if bracket[x-1] == 0:
                    btadd(x+1,-1)
            bracket[x] = 1
    else:
        l, r = indata[offset + 1], indata[offset + 2]
        offset += 3
        ans = btsum(r) - btsum(l)
        print("{}".format(ans))