제출 #217052

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
217052		lukameladze	Bigger segments (IZhO19_segments)	C++14	100 / 100	326 ms	20860 KiB

segments

# include <bits/stdc++.h>
using namespace std;
long long n,a[500005],le,ri,mid,sum[500005],s1,ans;
pair <long long , long long> dp[500005];
int main()
{
     cin>>n;
     for (long long i=1; i<=n; i++)
     {
          cin>>a[i];
          sum[i]=sum[i-1]+a[i];
     }
     for (long long i=1; i<=n; i++)
     {
          dp[i].second=max(dp[i].second,dp[i-1].second);
          s1=sum[i]-sum[dp[i].second];
          dp[i].first=dp[dp[i].second].first+1;
          le=i+1;
          ri=n;
          ans=0;
          while (le<=ri)
          {
               mid=(le+ri)/2;
               if (sum[mid]-sum[i]>=s1)
               {
                    ri=mid-1;
                    ans=mid;
               }
               else le=mid+1;
          }
          dp[ans].second=i;
     }
     cout<<dp[n].first<<endl;
}

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