Submission #613980

#	Time	Username	Problem	Language	Result	Execution time	Memory
613980		1ne	Meetings (IOI18_meetings)	C++14	0 / 100	200 ms	3512 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>
using namespace std;

std::vector<long long> minimum_costs(std::vector<int> arr, std::vector<int> L,
                                     std::vector<int> R) {
  int m = (int)L.size();
  int n = (int)arr.size(); 
  vector<long long>ans(m);
  vector<long long>pref(n + 1),suff(n + 1);
  vector<vector<int>>sparce(n + 1,vector<int>(25));
  for (int i = 0;i<n;++i){
		sparce[i][0] = arr[i];
  }
  for (int i = 1;i<25;++i){
		for (int j = 0;j + (1<<(i - 1)) < n;++j){
			sparce[j][i] = min(sparce[j][i - 1],sparce[j + (1<<(i - 1))][i - 1]);
		}
  }
  auto getmax = [&](int from,int to){
    int lg = 32 - __builtin_clz(to - from + 1) - 1;
    return max(sparce[from][lg], sparce[to - (1 << lg) + 1][lg]); 
  };
  priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>q;
  vector<int>pref_cnt(n + 1,0),suff_cnt(n + 1,0);
  for (int i = 0;i < n;++i){
	  pref[i + 1] = pref[i] + arr[i];
	  int counts = 1;
	  while(!q.empty() && q.top().first < arr[i]){
			pref[i + 1] += (arr[i] - q.top().first)*q.top().second;
			pref_cnt[i + 1] +=(arr[i] - q.top().first) * q.top().second;
			counts+=q.top().second;
			q.pop();
	  }  
	  q.push({arr[i],counts});
  }
  while(!q.empty())q.pop();
  for (int i = n - 1;i>=0;--i){
		suff[i] = suff[i + 1] + arr[i];
		int counts = 1;
		while(!q.empty() && q.top().first < arr[i]){
			suff[i]+=(arr[i] - q.top().first) * q.top().second;	
			suff_cnt[i]+=(arr[i] - q.top().first) * q.top().second;
			counts+=q.top().second;
			q.pop();
		}
		q.push({arr[i],counts});
  }
  for (int i = 1;i<=n;++i){
		pref_cnt[i] +=pref_cnt[i - 1];
  }
  for (int i = n - 1;i>=0;--i){
		suff_cnt[i] +=suff_cnt[i + 1];
  }
  for (int i = 0;i<m;++i){
	  long long answer = LLONG_MAX;
	  for (int j = L[i];j<=R[i];++j){
		 //cout<<i<<" "<<pref[j]<<" "<<suff[j]<<'\n';
		 answer = min(answer,pref[j + 1] + suff[j] - arr[j] - pref[L[i]] - suff[R[i] + 1] - pref_cnt[L[i] + 1] - suff_cnt[R[i]]);
	  }
	  ans[i] = answer;
  }
  return ans;
}

Compilation message (stderr)

meetings.cpp: In function 'std::vector<long long int> minimum_costs(std::vector<int>, std::vector<int>, std::vector<int>)':
meetings.cpp:20:8: warning: variable 'getmax' set but not used [-Wunused-but-set-variable]
   20 |   auto getmax = [&](int from,int to){
      |        ^~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40