Submission #1050071

#TimeUsernameProblemLanguageResultExecution timeMemory
1050071matereElection (BOI18_election)C++14
0 / 100
28 ms160592 KiB
#include<bits/stdc++.h> using namespace std; int a[500005],pref[500005],suf[500005],lg[500005]; pair<int,int>spp[500005][20],sps[500005][20]; vector<int>v; int main(){ int n; char c; cin>>n; for(int i=2;i<=500004;i++) lg[i]=lg[i/2]+1; for(int i=1;i<=500004;i++) spp[i][0].first=sps[i][0].first=1e9; v.push_back(0); for(int i=1;i<=n;i++){ cin>>c; if(c=='T') v.push_back(i); a[i]=(c=='C')*2-1; pref[i]=pref[i-1]+a[i]; spp[i][0].first=pref[i]; spp[i][0].second=i; } v.push_back(n+1); for(int i=n;i>=1;i--){ suf[i]=suf[i+1]+a[i]; sps[i][0].first=suf[i]; sps[i][0].second=i; } for(int pr=1;pr<=19;pr++){ for(int i=1;i<=n;i++){ spp[i][pr].second=spp[i][pr-1].second; sps[i][pr].second=sps[i][pr-1].second; if(spp[i][pr-1].first>spp[min(n,i+(1<<(pr-1)))][pr-1].first) spp[i][pr].second=spp[min(n,i+(1<<(pr-1)))][pr-1].second; if(sps[i][pr-1].first>sps[min(n,i+(1<<(pr-1)))][pr-1].first) sps[i][pr].second=sps[min(n,i+(1<<(pr-1)))][pr-1].second; spp[i][pr].first=min(spp[i][pr-1].first,spp[min(n,i+(1<<(pr-1)))][pr-1].first); sps[i][pr].first=min(sps[i][pr-1].first,sps[min(n,i+(1<<(pr-1)))][pr-1].first); } } int q; cin>>q; for(int i=1;i<=q;i++){ int l,r; cin>>l>>r; int mn1=min(spp[l][lg[r-l+1]].first,spp[r-(1<<lg[r-l+1])+1][lg[r-l+1]].first); int mn1i=spp[l][lg[r-l+1]].second; if(spp[l][lg[r-l+1]].first>spp[r-(1<<lg[r-l+1])+1][lg[r-l+1]].first) mn1i=spp[r-(1<<lg[r-l+1])+1][lg[r-l+1]].second; int mn2=min(sps[l][lg[r-l+1]].first,sps[r-(1<<lg[r-l+1])+1][lg[r-l+1]].first); int mn2i=sps[l][lg[r-l+1]].second; if(sps[l][lg[r-l+1]].first>sps[r-(1<<lg[r-l+1])+1][lg[r-l+1]].first) mn2i=sps[r-(1<<lg[r-l+1])+1][lg[r-l+1]].second; mn1-=pref[l-1]; mn2-=suf[r+1]; cout<<max(-mn1,max(-mn2,-mn1-mn2-((int)(upper_bound(v.begin(),v.end(),mn1i)-v.begin())-(int)(lower_bound(v.begin(),v.end(),mn2i)-v.begin()))))<<endl; } }
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