Submission #524157

#	Time	Username	Problem	Language	Result	Execution time	Memory
524157		inluminas	Bigger segments (IZhO19_segments)	C++17	13 / 100	1 ms	332 KiB

segments

#include"bits/stdc++.h"
using namespace std;
 
#define ll long long
#define endl "\n"
#define fastio ios_base::sync_with_stdio(false)
#define inf LLONG_MAX

int main(){
  fastio;

  int n;
  cin>>n;
  ll pre[n+1],dp[n+1],ans[n+1];
  pre[0]=0;
  for(int i=1;i<=n;i++){
    ll x;
    cin>>x;
    pre[i]=pre[i-1]+x;
    dp[i]=ans[i]=0;
  }
  dp[0]=ans[0]=0;
  for(int i=1;i<=n;i++){
    int lo=0,hi=i-1;
    while(hi-lo>1){
      int mid=(lo+hi)>>1;
      if(pre[i]-pre[mid]>=dp[mid]) lo=mid;
      else hi=mid;
    }
    if(pre[i]-pre[hi]>=dp[hi]){
      dp[i]=pre[i]-pre[hi];
      ans[i]=ans[hi]+1;
    }else if(pre[i]-pre[lo]>=dp[lo]){
      dp[i]=pre[i]-pre[lo];
      ans[i]=ans[lo]+1;
    }else{
      dp[i]=pre[i];
      ans[i]=1;
    }
  }

  cout<<ans[n]<<endl;
  return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27