This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define MAXN 300007
using namespace std;
struct ST{
int tree[4*MAXN],tree2[4*MAXN];
void update(int v,int l,int r,int pos,int val){
if(l==r){
tree[v]=tree2[v]=val;
}else{
int tt=(l+r)/2;
if(pos<=tt)update(2*v,l,tt,pos,val);
else update(2*v+1,tt+1,r,pos,val);
tree[v]=min(tree[2*v],tree[2*v+1]);
tree2[v]=max(tree2[2*v],tree2[2*v+1]);
}
}
int getmin(int v,int l,int r,int ll,int rr){
if(ll>rr)return 1;
if(l==ll and r==rr){
return tree[v];
}else{
int tt=(l+r)/2;
return min( getmin(2*v,l,tt,ll,min(tt,rr)) , getmin(2*v+1,tt+1,r,max(tt+1,ll),rr) );
}
}
int getmax(int v,int l,int r,int ll,int rr){
if(ll>rr)return 0;
if(l==ll and r==rr){
return tree2[v];
}else{
int tt=(l+r)/2;
return max( getmax(2*v,l,tt,ll,min(tt,rr)) , getmax(2*v+1,tt+1,r,max(tt+1,ll),rr) );
}
}
}st;
int n,q,tim,x,l,r;
char c[MAXN];
int last[MAXN],sum[MAXN];
string type;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n>>q>>(c+1);
for(int i=1;i<=n;i++){
if(c[i]=='1')st.update(1,1,n,i,1);
}
for(int i=1;i<=q;i++){
cin>>type;
if(type=="toggle"){
cin>>x;
if(c[x]=='0'){
c[x]='1'; last[x]=i;
st.update(1,1,n,x,i+1);
}else{
c[x]='0'; sum[x]+=i-last[x];
}
}else{
cin>>l>>r;
if(l+1<r){
int s=st.getmin(1,1,n,l,r-1);
if(s==0)cout<<0<<"\n";
else cout<<i+1-st.getmax(1,1,n,l,r-1)<<"\n";
}else{
if(c[l]=='0')cout<<sum[l]<<"\n";
else cout<<sum[l]+i-last[l]<<"\n";
}
}
}
return 0;
}
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