最长公共子序列变形。

#include<iostream>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<cstdio>
#include<map>
#include<queue>
#include<string>
#include<vector>
using namespace std; int n,M,L;
int a[],b[];
int dp[][]; int MAX(int a,int b,int c)
{
return max(a,max(b,c));
} int main()
{
scanf("%d",&n);
scanf("%d",&M); for(int i=;i<=M;i++) scanf("%d",&a[i]);
scanf("%d",&L); for(int i=;i<=L;i++) scanf("%d",&b[i]);
memset(dp,,sizeof dp);
for(int i=;i<=M;i++)
{
for(int j=;j<=L;j++)
{
if(a[i]==b[j]) dp[i][j]=MAX(dp[i-][j-],dp[i-][j],dp[i][j-])+;
else dp[i][j]=max(dp[i-][j],dp[i][j-]);
}
}
printf("%d\n",dp[M][L]);
return ;
}

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