49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#include<cstdio>
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#include<string>
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#include<cstring>
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#include<iostream>
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#include<cmath>
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#include<algorithm>
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using namespace std;
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int dp[1005][1005],sum[1005],a[1005],s[1005][1005];
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int main()
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{
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int n,m,r;
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while(scanf("%d%d%d",&n,&m,&r)!=EOF)
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{
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for(int i=1;i<=n;i++)
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{
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scanf("%d",&a[i]);
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sum[i]=sum[i-1]+a[i];
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}
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memset(dp,-1,sizeof(dp));
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memset(s,-0x1f1f1f1f,sizeof(s));
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dp[0][0]=0;s[0][0]=-sum[1];
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for(int i=1;i<=n;i++)
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{
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if(i>=r)
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{
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dp[0][i]=sum[i];
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}
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dp[i][i]=0;
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s[0][i]=max(s[0][i-1],dp[0][i]-sum[i+1]);
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}
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for(int i=1;i<=m;i++)
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{
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for(int j=i;j<=n;j++)
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{
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if(dp[i-1][j-1]!=-1)
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dp[i][j]=max(dp[i-1][j-1],dp[i][j]);
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if(j-r>=i&&s[i-1][j-r-1]!=-0x1f1f1f1f)
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dp[i][j]=max(dp[i][j],sum[j]+s[i-1][j-r-1]);
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if(dp[i][j]!=-1)
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s[i][j]=max(s[i][j-1],dp[i][j]-sum[j+1]);
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else
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s[i][j]=s[i][j-1];
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}
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}
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printf("%d\n",dp[m][n]);
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}
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return 0;
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}
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