CSU 1120 病毒（DP）

题目链接：http://acm.csu.edu.cn/OnlineJudge/problem.php?id=1120

解题报告：dp，用一个串去更新另一个串，递推方程是：

if(b[i] > a[j])
m = max(m,dp[j]);
else if(b[i] == a[j]) dp[j] = m + 1;

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<iostream>
 4 #include<algorithm>
 5 using namespace std;
 6 const int maxn = 1005;
 7 int a[maxn],b[maxn],dp[maxn];
 8 
 9 int main()
10 {
11     int T,n,m;
12     scanf("%d",&T);
13     while(T--)
14     {
15         scanf("%d",&n);
16         for(int i = 1;i <= n;++i)
17         scanf("%d",&a[i]);
18         scanf("%d",&m);
19         for(int i = 1;i <= m;++i)
20         scanf("%d",&b[i]);
21         memset(dp,0,sizeof(dp));
22         for(int i = 1;i <= m;++i)
23         {
24             int m = 0;
25             for(int j = 1;j <= n;++j)
26             {
27                 if(b[i] > a[j])
28                 m = max(m,dp[j]);
29                 else if(b[i] == a[j]) dp[j] = m + 1;
30             }
31         }
32         int ans = 0;
33         for(int i = 1;i <= n;++i)
34         ans = max(ans,dp[i]);
35         printf("%d
",ans);
36     }
37     return 0;
38 }

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