【BZOJ1270】1270: [BeijingWc2008]雷涛的小猫 DP

Description

 

Input

Output

Sample Input

Sample Output

8

HINT

Source

唉这么蠢的Dp没一下子看出来，Dp真是太弱了啦。

 #include <iostream>
 #include <cstdio>
 #include <cstring>
 #include <cmath>
 using namespace std;
 int f1[],eat[][],f2[];
 int n,h,d;
 int read()
 {
     int ans=;char c;
     while ((c=getchar())==' ' || c=='\n' || c=='\r');
     ans=c-'';
     while (isdigit(c=getchar()))    ans=ans*+c-'';
     return ans;
 }
 
 int main()
 {
     n=read();h=read();d=read();
     for (int i=;i<=n;i++)
     {
         int x;
         x=read();
         for (int j=;j<=x;j++)
         {
             int a;
             a=read();
             eat[i][a]++;
         }
     }
     for (int i=h;i>=;i--)
     {
         int t=i+d<=h?f1[i+d]:;
         for (int j=;j<=n;j++)
         {
             f2[j]=max(f2[j],t)+eat[j][i];
             f1[i]=max(f1[i],f2[j]);
         }
     }
     printf("%d\n",f1[]);
     return ;
 }