Submission #405594

#	Time	Username	Problem	Language	Result	Execution time	Memory
405594		sad	Cigle (COI21_cigle)	C++14	100 / 100	963 ms	333216 KiB

cigle

#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=5100,M=5000*5009;
pair<int,int>dp[N][N];int a[N],prf[M];
pair<int,int>mxdp[N][N];
vector<int>v;
int main()
{ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n;int ans=0;int rw=0;
    for(int i=1;i<n+1;i++)cin>>a[i];memset(prf,-1,sizeof prf);
    for(int m=1;m<=n;m++)
    {
        for(auto it:v)prf[it]=-1;
        v.clear();
        int re=0;v.pb(0);
        for(int i=m;i>0;i--)
        {
            re+=a[i];v.pb(re);
            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);
        rw=0;
        for(int r=m+2;r<n+1;r++)
        {re+=a[r-1];
            if(prf[re]!=-1)rw++;
            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;
            }
            pair<int,int>z=mxdp[m][prf[re]-2];
            z.fi+=rw;
            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 (stderr)

cigle.cpp: In function 'int main()':
cigle.cpp:14:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   14 |     for(int i=1;i<n+1;i++)cin>>a[i];memset(prf,-1,sizeof prf);
      |     ^~~
cigle.cpp:14:37: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   14 |     for(int i=1;i<n+1;i++)cin>>a[i];memset(prf,-1,sizeof prf);
      |                                     ^~~~~~
cigle.cpp:42:17: warning: unused variable 'last' [-Wunused-variable]
   42 |             int last=dp[r-1][m].se;
      |                 ^~~~

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 52 / 52