oj.uz

Submission #405522

# Submission time Handle Problem Language Result Execution time Memory
405522 2021-05-16T13:56:53 Z sad Cigle (COI21_cigle) C++14
22 / 100
 193 ms 255364 KB 
#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define pb push_back
using namespace std;
int n;const int N=510,M=5009;
pair<int,int>dp[N][N];int a[N],fr[M],rw[N][N][N],prf[M];
pair<int,int>mxdp[N][N];
int main()
{
    cin>>n;int ans=0;
    for(int i=1;i<n+1;i++)cin>>a[i];
    for(int i=2;i<n;i++)
    {
        int sm=0;
        for(int j=i+1;j<n+1;j++)
        {
            if(j!=i+1)
            {
                sm+=a[j-1];
                fr[sm]=1;
            }

            int s=0,rs=0;
            for(int q=i-1;q>-1;q--)
            {
                if(q!=i-1)
                {
                    s+=a[q+2];
                    if(fr[s])
                        rs++;
                }
                rw[q][i][j]=rs;
            }

        }
        for(int j=n;j>i;j--)
        {
            if(j!=i+1)
            {
                fr[sm]=0;
                sm-=a[j-1];
            }
        }

    }
    for(int m=1;m<=n;m++)
    {
        memset(prf,-1,sizeof prf);
        int re=0;
        for(int i=m;i>0;i--)
        {
            re+=a[i];
            prf[re]=i;
        }
        re=0;
        dp[m][m]={0,n+1};
        for(int i=1;i<=m;i++)
        {

            if(dp[m][i].fi>=mxdp[m][i-1].fi)
            {
                mxdp[m][i]={dp[m][i].fi,i};continue;
            }
            mxdp[m][i]=mxdp[m][i-1];
        }
        dp[m+1][m]=mxdp[m][m];
        for(int r=m+2;r<n+1;r++)
        {re+=a[r-1];
            int last=dp[r-1][m].se;
            int mx=dp[r-1][m].fi;
            if(prf[re]==-1||prf[re]-2<0)
            {
                dp[r][m]=dp[r-1][m];
                ans=max(ans,dp[r][m].fi);continue;
            }
            if(last+2<=prf[re])
            {
                dp[r][m]={mx+1,last};
                ans=max(ans,dp[r][m].fi);continue;
            }
            pair<int,int>z=mxdp[m][prf[re]-2];
            //if(r==n&&m==8)cout<<z.fi<<endl;
            z.fi+=rw[prf[re]-2][m][r];
            if(z.fi>mx)
            {
                dp[r][m]=z;
                ans=max(ans,z.fi);continue;
            }
            dp[r][m]=dp[r-1][m];
            ans=max(ans,dp[r][m].fi);
            continue;
        }
    }
    cout<<ans;

}
/*
10
2 3 2 1 1 5 5 2 5 1
*/

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 844 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 972 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 844 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 972 KB Output is correct
10 Correct 4 ms 7508 KB Output is correct
11 Correct 4 ms 7500 KB Output is correct
12 Correct 4 ms 7500 KB Output is correct
13 Correct 4 ms 7500 KB Output is correct
14 Correct 4 ms 7500 KB Output is correct
15 Correct 4 ms 7500 KB Output is correct
16 Correct 5 ms 8524 KB Output is correct
17 Incorrect 4 ms 7500 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 193 ms 255204 KB Output is correct
2 Correct 165 ms 255200 KB Output is correct
3 Correct 161 ms 255228 KB Output is correct
4 Correct 160 ms 255288 KB Output is correct
5 Correct 160 ms 255216 KB Output is correct
6 Correct 164 ms 255300 KB Output is correct
7 Correct 162 ms 255300 KB Output is correct
8 Correct 164 ms 255300 KB Output is correct
9 Correct 162 ms 255288 KB Output is correct
10 Correct 162 ms 255268 KB Output is correct
11 Correct 160 ms 255288 KB Output is correct
12 Correct 162 ms 255364 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 844 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 972 KB Output is correct
10 Correct 4 ms 7508 KB Output is correct
11 Correct 4 ms 7500 KB Output is correct
12 Correct 4 ms 7500 KB Output is correct
13 Correct 4 ms 7500 KB Output is correct
14 Correct 4 ms 7500 KB Output is correct
15 Correct 4 ms 7500 KB Output is correct
16 Correct 5 ms 8524 KB Output is correct
17 Incorrect 4 ms 7500 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #5
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 844 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 972 KB Output is correct
10 Correct 4 ms 7508 KB Output is correct
11 Correct 4 ms 7500 KB Output is correct
12 Correct 4 ms 7500 KB Output is correct
13 Correct 4 ms 7500 KB Output is correct
14 Correct 4 ms 7500 KB Output is correct
15 Correct 4 ms 7500 KB Output is correct
16 Correct 5 ms 8524 KB Output is correct
17 Incorrect 4 ms 7500 KB Output isn't correct
18 Halted 0 ms 0 KB -