#include<bits/stdc++.h>
using namespace std;
const int maxn=300000+10;
int n,q,all[maxn],res[maxn],now,qu[maxn];
set<int>st;
int fn[maxn],kaf=(1<<19);
struct offt2fen{
vector<pair<int,int>>ady[maxn];
void upd(int l,int r,int w){
//cout<<"updy: "<<l<<" "<<r<<" "<<w<<endl;
l++;
r++;
while(l<maxn){
int fr=r;
while(fr<maxn){
ady[l].push_back(make_pair(-fr,w));
fr+=(fr&(-fr));
}
l+=((-l)&l);
}
}
void pors(int l,int r,int w){
//cout<<"porsi: "<<l<<" "<<r<<" "<<w<<endl;
l++;
r++;
while(l>0){
int fr=r;
while(fr>0){
ady[l].push_back(make_pair(fr,w));
fr-=(fr&(-fr));
}
l-=((-l)&l);
}
}
void cal(int i){
for(auto x:ady[i]){
if(x.first<0){
x.first=-x.first;
fn[x.first]+=x.second;
}
else{
res[x.second]+=fn[x.first];
}
}
for(auto x:ady[i]){
fn[x.first]=0;
}
}
void build(){
for(int i=0;i<maxn;i++){
cal(i);
}
}
}fen;
struct segment{
long long seg[(1<<20)];
void upd(int i,int w){
//cout<<"hey: "<<i-kaf<<" "<<w<<endl;
while(i>0){
if(i>=kaf){
seg[i]=w;
}
else{
seg[i]=max(seg[(i<<1)],seg[(i<<1)^1]);
}
i>>=1;
}
}
int pors(int i,int l,int r,int tl,int tr){
if(l>r||l>tr||r<tl||tl>tr){
return 0;
}
if(l>=tl&&r<=tr){
return seg[i];
}
int m=(l+r)>>1;
return max(pors((i<<1),l,m,tl,tr),pors((i<<1)^1,m+1,r,tl,tr));
}
}seg;
void calu(int l,int r){
// if(l>r){
// return ;
// }
int t=now-seg.pors(1,0,kaf-1,l,r);
fen.upd(l,l,t);
fen.upd(l,r+1,-t);
fen.upd(r+1,l,-t);
fen.upd(r+1,r+1,t);
}
void upd(int ind){
st.erase(ind);
auto y=st.lower_bound(ind);
int nx=*y;
y--;
int ps=*y;
if(all[ind]){
calu(ind+1,nx-1);
calu(ps+1,ind-1);
seg.upd(ind+kaf,now);
}
else{
calu(ps+1,nx-1);
seg.upd(ind+kaf,maxn+10);
st.insert(ind);
}
all[ind]^=1;
}
void pors(int l,int r){
//cout<<"Wtf: "<<l<<" "<<r<<" "<<seg.pors(1,0,kaf-1,l,r)<<endl;
res[now]+=max(0,now-seg.pors(1,0,kaf-1,l,r));
fen.pors(l,r,now);
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
//cout.tie(0);
cin>>n>>q;
st.insert(0);
st.insert(n+1);
for(int i=1;i<=n;i++){
char c;
cin>>c;
all[i]=c-'0';
all[i]^=1;
if(all[i]==1){
st.insert(i);
seg.upd(i+kaf,maxn+10);
}
}
for(int i=1;i<=q;i++){
now=i;
string s;
int l,r;
cin>>s>>l;
if(s[0]=='q'){
cin>>r;
pors(l,r);
qu[now]=1;
}
else{
upd(l);
}
}
fen.build();
for(int i=1;i<=q;i++){
if(qu[i]==1){
cout<<res[i]<<"\n";
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
16 ms |
33816 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
16 ms |
33816 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
24 ms |
41844 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
16 ms |
33816 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
