제출 #405530

#제출 시각아이디문제언어결과실행 시간메모리
405530sadCigle (COI21_cigle)C++14
0 / 100
164 ms255244 KiB
#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}; dp[m][0]={0,1}; 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 */
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