Submission #994979

#	Time	Username	Problem	Language	Result	Execution time	Memory
994979		fuad27	Holiday (IOI14_holiday)	C++17	7 / 100	5065 ms	10832 KiB

holiday

#include"holiday.h"
#include <bits/stdc++.h>
using namespace std;
int n, start, d;
vector<int> attraction;
vector<long long> F, S, F2, S2;

long long get(int l, int r, int k) {
  long long res=0;
  priority_queue<int> pq;
  for(int i = l;i<=r;i++)pq.push(attraction[i]);
  while(pq.size() && k>0) {
    res+=pq.top();
    pq.pop();
    k--;
  }
  return res;
}

void calcf1(int l, int r, int pl, int pr) {
  if(l>r)return;
  int mid = (l+r)/2;
  long long res=0;
  int opt = pl;
  for(int i = pl;i<=pr;i++) {
    long long val = get(start, i, mid-abs(i-start));
    if(val >= res) {
      res=val;
      opt=i;
    }
  }
  F[mid] = res;
  calcf1(l, mid-1, pl, opt);
  calcf1(mid+1, r, opt, pr);
}
void calcs1(int l, int r, int pl, int pr) {
  if(l>r)return;
  int mid = (l+r)/2;
  long long res=0;
  int opt = pl;
  for(int i = pl;i<=pr;i++) {
    long long val = get(start, i, mid-2*abs(i-start));
    if(val >= res) {
      res=val;
      opt=i;
    }
  }
  S[mid] = res;
  calcs1(l, mid-1, pl, opt);
  calcs1(mid+1, r, opt, pr);
}
//
void calcf2(int l, int r, int pl, int pr) {
  if(l>r)return;
  int mid = (l+r)/2;
  long long res=0;
  int opt = pl;
  for(int i = pl;i<=pr;i++) {
    long long val = get(i, start-1, mid-abs(i-start));
    if(val >= res) {
      res=val;
      opt=i;
    }
  }
  F2[mid] = res;
  calcf2(l, mid-1, opt, pr);
  calcf2(mid+1, r, pl, opt);
}
void calcs2(int l, int r, int pl, int pr) {
  if(l>r)return;
  int mid = (l+r)/2;
  long long res=0;
  int opt = pl;
  for(int i = pl;i<=pr;i++) {
    long long val = get(i,start-1, mid-2*abs(i-start));
    if(val >= res) {
      res=val;
      opt=i;
    }
  }
  S2[mid] = res;
  calcs2(l, mid-1, opt, pr);
  calcs2(mid+1, r, pl, opt);
}
long long int findMaxAttraction(int _n, int _start, int _d, int _attraction[]) {
  n=_n;
  start=_start;
  d=_d;
  S.resize(d+1);
  F.resize(d+1);
  S2.resize(d+1);
  F2.resize(d+1);
  attraction=vector<int>(_attraction, _attraction+_n);
  calcf1(1, _d, _start, _n-1);
  calcs1(1, _d, _start, _n-1);
  calcf2(1, _d, 0, _start-1);
  calcs2(1, _d, 0, _start-1);
  long long res=0;
  for(int i = 0;i<=d;i++) {
    res=max(res, F[i]+S2[d-i]);
    res=max(res, S[i]+F2[d-i]);
  }
  return res;
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 23
• Subtask 3: 0 / 17
• Subtask 4: 0 / 53