제출 #857547

#제출 시각아이디문제언어결과실행 시간메모리
857547abcvuitunggio휴가 (IOI14_holiday)C++17
100 / 100
1332 ms12220 KiB
#include"holiday.h" #include <bits/stdc++.h> using namespace std; int n,s,d,a[100001],idx[100001],pos[100001]; long long p[250001][2]; pair <long long, int> st[400001]; void update(int node, int l, int r, int i){ if (l>i||r<i||l>r) return; if (l==r){ st[node].second^=1; st[node].first=st[node].second*a[i]; return; } int mid=(l+r)>>1; update(node<<1,l,mid,i); update(node<<1|1,mid+1,r,i); st[node]={st[node<<1].first+st[node<<1|1].first,st[node<<1].second+st[node<<1|1].second}; } long long get(int node, int l, int r, int x){ if (st[node].second<=x) return st[node].first; int mid=(l+r)>>1; return (st[node<<1|1].second<x?get(node<<1,l,mid,x-st[node<<1|1].second)+st[node<<1|1].first:get(node<<1|1,mid+1,r,x)); } void dnc(int l, int r, int optl, int optr, int idx){ if (l>r||optl>optr) return; int mid=(l+r)>>1; pair <long long, int> tmp={0,-1e9}; for (int i=optl;i<=min(s+mid/(idx+1),optr);i++){ update(1,0,n-1,pos[i]); tmp=max(tmp,make_pair(get(1,0,n-1,mid-(i-s)*(idx+1)),-i)); } p[mid][idx]=tmp.first; int opt=-tmp.second; for (int i=opt;i<=min(s+mid/(idx+1),optr);i++) update(1,0,n-1,pos[i]); dnc(mid+1,r,opt,optr,idx); for (int i=optl;i<opt;i++) update(1,0,n-1,pos[i]); dnc(l,mid-1,optl,opt,idx); } long long solve(){ for (int i=0;i<n;i++) idx[i]=i; for (int i=0;i<=d;i++) p[i][0]=p[i][1]=0; sort(idx,idx+n,[](int i, int j){return make_pair(a[i],i)<make_pair(a[j],j);}); sort(a,a+n); for (int i=0;i<n;i++) pos[idx[i]]=i; if (s<n-1){ s++; dnc(0,d,s,n-1,0); s--; } reverse(pos,pos+n); s=n-1-s; dnc(0,d,s,n-1,1); long long res=0; for (int i=0;i<d;i++) res=max(res,p[i][0]+p[d-i-1][1]); return res; } long long findMaxAttraction(int N, int start, int D, int attraction[]){ n=N; s=start; d=D; for (int i=0;i<n;i++) a[i]=attraction[i]; long long res=solve(); for (int i=0;i<n;i++) a[i]=attraction[n-i-1]; return max(res,solve()); }
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