Submission #361881

#	Time	Username	Problem	Language	Result	Execution time	Memory
361881		kimbj0709	Feast (NOI19_feast)	C++14	100 / 100	281 ms	10756 KiB

feast

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define f first
#define s second
int n,k;
vector<int> vect1;
pair<int,int> find(int val){
  vector<int> dp(n,0);
  vector<int> take(n,0);
  int currmin = 0;
  int currtake = 0;
  for(int i=0;i<n;i++){
    if(i!=0){
      dp[i] = dp[i-1];
      take[i] = take[i-1];
    }
    if(vect1[i]-currmin-val>dp[i]){
      dp[i] = vect1[i]-currmin-val;
      take[i] = currtake+1;
    }
    if(vect1[i]-dp[i]<currmin){
      currmin = vect1[i]-dp[i];
      currtake = take[i];
    }
  }
  return {dp[n-1],take[n-1]};

}
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);cout.tie(0);
  cin >> n >> k;
  int input;
  for(int i=0;i<n;i++){
    cin >> input;
    vect1.push_back(input);
  }
  for(int i=1;i<n;i++){
    vect1[i] += vect1[i-1];
  }
  int lo = 0,hi = 10e15;
  while(lo+1!=hi){
    int mid = (lo+hi)/2;
    if(find(mid).s>=k){
      lo = mid;
    }
    else{
      hi = mid;
    }
  }
  //cout << lo << " " << hi << endl;
  cout << find(lo).f+lo*k;
}

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 29 / 29