BZOJ2423 HAOI2010最长公共子序列(动态规划)

  大讨论。注意去重。

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cstring>
#include<algorithm>
using namespace std;
int read()
{
int x=,f=;char c=getchar();
while (c<''||c>'') {if (c=='-') f=-;c=getchar();}
while (c>=''&&c<='') x=(x<<)+(x<<)+(c^),c=getchar();
return x*f;
}
#define N 5010
#define P 100000000
int n,m,f[][N],g[][N];
char a[N],b[N];
int main()
{
#ifndef ONLINE_JUDGE
freopen("bzoj2423.in","r",stdin);
freopen("bzoj2423.out","w",stdout);
const char LL[]="%I64d\n";
#else
const char LL[]="%lld\n";
#endif
char c=getchar();
while (c>='A'&&c<='Z') a[++n]=c,c=getchar();
a[++n]=c,c=getchar();
while (c<'A'||c>'Z') c=getchar();
while (c>='A'&&c<='Z') b[++m]=c,c=getchar();
b[++m]=c,c=getchar();
for (int j=;j<=m;j++) g[][j]=;
for (int i=;i<=n;i++)
{
memset(f[i&],,sizeof(f[i&]));
memset(g[i&],,sizeof(g[i&]));
g[i&][]=;
for (int j=;j<=m;j++)
if (a[i]!=b[j])
{
f[i&][j]=max(f[i&^][j],f[i&][j-]);
if (f[i&^][j]==f[i&][j-])
{
if (f[i&^][j]==f[i&^][j-]) g[i&][j]=((g[i&^][j]+g[i&][j-])%P-g[i&^][j-]+P)%P;
else g[i&][j]=(g[i&^][j]+g[i&][j-])%P;
}
else if (f[i&^][j]>f[i&][j-]) g[i&][j]=g[i&^][j];
else g[i&][j]=g[i&][j-];
}
else
{
f[i&][j]=f[i&^][j-]+;
g[i&][j]=g[i&^][j-];
if (f[i&][j]==f[i&^][j]) g[i&][j]=(g[i&][j]+g[i&^][j])%P;
if (f[i&][j]==f[i&][j-]) g[i&][j]=(g[i&][j]+g[i&][j-])%P;
}
}
cout<<f[n&][m]-<<endl<<g[n&][m];
return ;
}
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