oj.uz

Submission #405555

# Submission time Handle Problem Language Result Execution time Memory
405555 2021-05-16T14:24:35 Z sad Cigle (COI21_cigle) C++14
13 / 100
 286 ms 255300 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-1;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};
        mxdp[m][1]={dp[m][1].fi,1};
        for(int i=2;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-1];ans=max(ans,dp[m+1][m].fi);
        for(int r=m+1;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,mx);continue;
            }*/
            for(int l=0;l<m;l++)
                dp[r][m].fi=max(dp[r][m].fi,dp[m][l].fi+rw[l][m][r]);
            ans=max(ans,dp[r][m].fi);
            /*
            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];
            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,mx);
            continue;*/
        }
    }
    cout<<ans;

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

Compilation message

cigle.cpp: In function 'int main()':
cigle.cpp:72:17: warning: unused variable 'last' [-Wunused-variable]
   72 |             int last=dp[r-1][m].se;
      |                 ^~~~
cigle.cpp:73:17: warning: unused variable 'mx' [-Wunused-variable]
   73 |             int mx=dp[r-1][m].fi;
      |                 ^~

Subtask #1
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 Incorrect 1 ms 972 KB Output isn't correct
8 Halted 0 ms 0 KB -

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 Incorrect 1 ms 972 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 236 ms 255212 KB Output is correct
2 Correct 228 ms 255188 KB Output is correct
3 Correct 231 ms 255292 KB Output is correct
4 Correct 231 ms 255300 KB Output is correct
5 Correct 230 ms 255256 KB Output is correct
6 Correct 227 ms 255280 KB Output is correct
7 Correct 227 ms 255208 KB Output is correct
8 Correct 233 ms 255200 KB Output is correct
9 Correct 237 ms 255280 KB Output is correct
10 Correct 238 ms 255192 KB Output is correct
11 Correct 286 ms 255296 KB Output is correct
12 Correct 225 ms 255224 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 Incorrect 1 ms 972 KB Output isn't correct
8 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 Incorrect 1 ms 972 KB Output isn't correct
8 Halted 0 ms 0 KB -