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>
using namespace std;
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()
struct segtree{
ll n;
vector<ll>d;
vector<ll>u;
segtree(ll n):n(n){
d.resize(4*n);
build(1,1,n);
}
void build(ll node,ll l,ll r){
if(l==r){
d[node]=0;
return;
}
ll mid=(l+r)/2;
build(node*2,l,mid);
build(node*2+1,mid+1,r);
d[node]=max(d[node*2],d[node*2+1]);
}
ll query(ll node,ll l,ll r,ll L,ll R){
if(l > R || r < L || L > R){
return 0;
}
if(L <= l && r <= R){
return d[node];
}
ll mid=(l+r)/2;
return max(query(node*2,l,mid,L,R),query(node*2+1,mid+1,r,L,R));
}
void update(ll node,ll l,ll r,ll k,ll val){
if(l>k || r<k)return;
if(l==r){
d[node]=val;
return;
}
ll mid=(l+r)/2;
update(node*2,l,mid,k,val);
update(node*2+1,mid+1,r,k,val);
d[node]=max(d[node*2],d[node*2+1]);
}
};
int main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll n,q;
cin>>n>>q;
char s[n+5],cur[n+5];
for(ll i=1;i<=n;i++){
cin>>s[i];
}
vector<pair<ll,ll>>que(q+1);
for(ll i=1;i<=q;i++){
string t;
cin>>t;
if(t=="toggle"){
ll j;
cin>>j;
que[i]={j,-1};
}
else{
ll a,b;
cin>>a>>b;
que[i]={a,b};
}
}
segtree sg(n);
for(ll i=1;i<=n;i++){
if(s[i]=='1'){
sg.update(1,1,n,i,0);
}
else{
sg.update(1,1,n,i,1e18);
}
}
for(ll i=1;i<=q;i++){
if(que[i].ss==-1){
ll j=que[i].ff;
sg.update(1,1,n,j,i);
}
else{
ll a=que[i].ff,b=que[i].ss;
ll x=sg.query(1,1,n,a,b-1);
cout<<max(i-x,0ll)<<"\n";
}
}
}
Compilation message (stderr)
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:57:17: warning: unused variable 'cur' [-Wunused-variable]
57 | char s[n+5],cur[n+5];
| ^~~
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