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| #include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
int n, q;
char c[N];
int rt;
int ch[N][2], sz[N], val[N], fa[N], lmn[N], rmn[N], lmx[N], rmx[N], sum[N];
int rev[N], cov[N], inv[N];
bool rs(int x) { return ch[fa[x]][1]==x; }
void up(int p)
{
if(!p) return;
int l = ch[p][0], r = ch[p][1];
sz[p] = sz[l] + sz[r] + 1;
lmn[p] = min(lmn[l], sum[l]+val[p]+lmn[r]);
lmx[p] = max(lmx[l], sum[l]+val[p]+lmx[r]);
rmn[p] = min(rmn[r], sum[r]+val[p]+rmn[l]);
rmx[p] = max(rmx[r], sum[r]+val[p]+rmx[l]);
sum[p] = sum[l] + sum[r] + val[p];
}
void setv(int p, int v)
{
if(!p) return;
val[p] = v, sum[p] = v*sz[p];
lmn[p] = rmn[p] = min(0, sum[p]);
lmx[p] = rmx[p] = max(0, sum[p]);
cov[p] = v;
inv[p] = 0;
rev[p] = 0;
}
void setrev(int p)
{
if(!p) return;
swap(ch[p][0], ch[p][1]);
swap(lmn[p], rmn[p]);
swap(lmx[p], rmx[p]);
rev[p] ^= 1;
}
void setinv(int p)
{
if(!p) return;
swap(lmn[p], lmx[p]);
swap(rmn[p], rmx[p]);
lmn[p] *= -1;
lmx[p] *= -1;
rmn[p] *= -1;
rmx[p] *= -1;
sum[p] *= -1;
val[p] *= -1;
inv[p] ^= 1;
cov[p] *= -1;
}
void down(int p)
{
if(inv[p])
{
inv[p] = 0;
setinv(ch[p][0]); setinv(ch[p][1]);
}
if(cov[p])
{
setv(ch[p][0], cov[p]); setv(ch[p][1], cov[p]);
cov[p] = 0;
}
if(rev[p])
{
rev[p] = 0;
setrev(ch[p][0]); setrev(ch[p][1]);
}
}
void build(int l, int r, int f)
{
if(l>r) return;
int p = (l+r)>>1, v = (c[p-1]=='(' ? 1 : -1);
sz[p] = 1, sum[p] = val[p] = v;
fa[p] = f, ch[f][p>f] = p;
if(l==r)
{
lmx[p] = rmx[p] = max(0, v);
lmn[p] = rmn[p] = min(0, v);
return;
}
build(l, p-1, p); build(p+1, r, p);
up(p);
}
void rotate(int x)
{
int y = fa[x], z = fa[y], k = rs(x), w = ch[x][k^1];
ch[y][k] = w; fa[w] = y;
ch[z][rs(y)] = x; fa[x] = z;
ch[x][k^1] = y; fa[y] = x;
up(y); up(x);
}
void splay(int x, int g=0)
{
while(fa[x]!=g)
{
int y = fa[x];
if(fa[y]!=g) (rs(x)==rs(y) ? rotate(y) : rotate(x));
rotate(x);
}
if(!g) rt = x;
}
int kth(int p, int k)
{
down(p);
if(ch[p][0]&&sz[ch[p][0]]>=k) return kth(ch[p][0], k);
else if(sz[ch[p][0]]+1==k) return p;
else return kth(ch[p][1], k-sz[ch[p][0]]-1);
}
int split(int l, int r)
{
int x = kth(rt, l-1), y = kth(rt, r+1);
splay(x); splay(y, x);
return ch[y][0];
}
void replace(int l, int r, int v)
{
int x = split(l, r), y = fa[x];
setv(x, v);
up(y); up(fa[y]);
}
void reverse(int l, int r)
{
int x = split(l, r), y = fa[x];
setrev(x);
up(y); up(fa[y]);
}
void invert(int l, int r)
{
int x = split(l, r), y = fa[x];
setinv(x);
up(y); up(fa[y]);
}
int main()
{
scanf("%d%d", &n, &q);
scanf("%s", c+1);
build(1, n+2, 0);
rt = (n+3)>>1;
for(int i=1; i<=q; i++)
{
static char com[10], cc[2];
static int l, r;
scanf("%s%d%d", com, &l, &r);
++l, ++r;
if(com[0]=='R')
{
scanf("%s", cc);
replace(l, r, (cc[0]=='(' ? 1 : -1));
}
else if(com[0]=='Q')
{
int x = split(l, r);
int pmn = lmn[x], smx = rmx[x];
int y = fa[x];
up(y); up(fa[y]);
assert(pmn<=0); assert(smx>=0);
printf("%d\n", ((-pmn+1)>>1)+((smx+1)>>1));
}
else if(com[0]=='S') reverse(l, r);
else if(com[0]=='I') invert(l, r);
}
return 0;
}
|