제출 #597524

#제출 시각아이디문제언어결과실행 시간메모리
597524WongChun1234가로등 (APIO19_street_lamps)C++14
20 / 100
855 ms12672 KiB
#include<bits/stdc++.h> using namespace std; const int N=300050; int n,q,a,b,ch[N],curr[N],lst[N],seg[N<<2]; string ipt,tmp; void build(int id,int l,int r){ if (l==r){ seg[id]=(ipt[l-1]=='1')?0:INT_MAX; return; } int mid=(l+r)/2; build(id*2,l,mid); build(id*2+1,mid+1,r); seg[id]=max(seg[id*2],seg[id*2+1]); } void modify(int id,int l,int r,int ql,int val){ if (l>ql||r<ql) return; if (l==r){ seg[id]=val; return; } int mid=(l+r)/2; modify(id*2,l,mid,ql,val); modify(id*2+1,mid+1,r,ql,val); seg[id]=max(seg[id*2],seg[id*2+1]); } int query(int id,int l,int r,int ql,int qr){ if (l>qr||r<ql) return 0; if (l>=ql&&r<=qr) return seg[id]; int mid=(l+r)/2; return max(query(id*2,l,mid,ql,qr),query(id*2+1,mid+1,r,ql,qr)); } int main(){ cin>>n>>q; cin>>ipt; build(1,1,n); for (int i=1;i<=q;i++){ cin>>tmp; if (tmp[0]=='t'){ cin>>a; modify(1,1,n,a,i); }else{ cin>>a>>b; cout<<max(0,i-query(1,1,n,a,b-1))<<"\n"; } } }
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