Submission #1095752

#TimeUsernameProblemLanguageResultExecution timeMemory
1095752simona1230Joker (BOI20_joker)C++17
0 / 100
2 ms6488 KiB
#include <bits/stdc++.h> using namespace std; struct human { int a,b; human(){} human(int _a,int _b) { a=_a; b=_b; } }; int n,maxx; human h[200001]; bool cmp(human h1,human h2) { return h1.a<h2.a; } void read() { cin>>n; for(int i=1;i<=n;i++) { cin>>h[i].a>>h[i].b; maxx=max(maxx,h[i].b); } sort(h+1,h+n+1,cmp); } struct line { int a,b; line(){} line(int _a,int _b) { a=_a; b=_b; } int value(int x) { return a*x+b; } }; int sq; vector<line> v[200001]; int query(int b,int x) { if(v[b].size()==0)return 0; if(v[b].size()==1)return v[b][0].value(x); int ans=0; int l=0,r=v[b].size()-2; while(l<=r) { int m=(l+r)/2; if(v[b][m].value(x)>v[b][m+1].value(x)) { ans=max(ans,v[b][m].value(x)); r=m-1; } else { ans=max(ans,v[b][m+1].value(x)); l=m+2; } } return ans; } double intersect(line l1,line l2) { return (double)(l2.b-l1.b)/(double)(l1.a-l2.a); } void add_to(int b,line l) { while(v[b].size()>=2&&intersect(v[b][v[b].size()-1],l)<intersect(v[b][v[b].size()-2],l))v[b].pop_back(); v[b].push_back(l); } int add[200001]; int cnt[200001]; void solve() { int ans=0; sq=sqrt(maxx); int k=maxx/sq; if(maxx%sq)k++; for(int i=1;i<=n;i++) { cnt[h[i].b]++; int b=h[i].b/sq; if(h[i].b%sq)b++; add[b]++; vector<line> in; int till=0; for(int j=min(maxx,b*sq);j>=(b-1)*sq+1;j--) { till+=cnt[j]; in.push_back({j,till*j}); } for(int j=in.size()-1;j>=0;j--) add_to(b,in[j]); till=0; int As=0; if(i!=n)As=(h[i+1].a*(n-i)); for(int j=k;j>=1;j--) { ans=max(ans,query(j,till)+As); //cout<<(j-1)*sq<<" "<<j*sq<<" "<<query(j,till)<<endl; till+=add[j]; } //cout<<i<<" ! "<<ans<<" "<<h[i].a<<" "<<h[i].b<<endl; } cout<<ans<<endl; } int main() { read(); solve(); return 0; }
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