http://poj.org/problem?id=1692 #include<iostream> using namespace std; int links[101][101]; int f[101],s[101],n,m; int answer; void find() {int i,j,t,k,h; links[0][0]=0; links[0][1]=0; links[1][0]=0; for(i=1;i<=n;i++) for(j=1;j<=m;j++) {t=links[i-1][j]>links[i][j-1]?links[i-1][j]:links[i][j-1]; if(f[i]!=s[j]) { for(k=i-1;k>=1;k--) if(f[k]==s[j])break; for(h=j-1;h>=1;h--) if(f[i]==s[h])break; if(k&&h&&links[k-1][h-1]+1>t)t=links[k-1][h-1]+1; } links[i][j]=t; } } int main() {int i,t; cin>>t; while(t--) {cin>>n>>m; for(i=1;i<=n;i++)cin>>f[i]; for(i=1;i<=m;i++)cin>>s[i]; find(); cout<<links[n][m]*2<<endl; } return 0; }
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