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## hmm... help me

Posted by hangil at 2010-05-12 21:29:06 on Problem 2127
```I tried but faild
hmm.. this problem is LCS????
my source is

#include <stdio.h>

int n, m;

int a[505];
int b[505];

int dy[505][505];
int check[505][505];

void input()
{
int i;
scanf("%d", &n);
for(i=1;i<=n;i++)
{
scanf("%d", &a[i]);
}
scanf("%d", &m);
for(i=1;i<=m;i++)
{
scanf("%d", &b[i]);
}
}

void back(int x, int y, int cnt)
{
int i;
if(x==0 || y==0)
{
return;
}
if(a[x]==b[y])
{
back(x-1, y-1, cnt+1);
printf("%d ", a[x]);
}
else if(dy[x-1][y]>dy[x][y-1])
{
back(x-1, y, cnt);
}
else
{
back(x, y-1, cnt);
}
}

void process()
{
int i, j;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(a[i]==b[j] && a[i]>check[i-1][j-1])
{
dy[i][j]=dy[i-1][j-1]+1;
check[i][j]=a[i];
}
else
{
if(dy[i-1][j]>dy[i][j-1])
{
dy[i][j]=dy[i-1][j];
check[i][j]=check[i-1][j];
}
else
{
dy[i][j]=dy[i][j-1];
check[i][j]=check[i][j-1];
}
}
}
}
printf("%d\n", dy[n][m]);
back(n, m, 0);
}

int main()
{
input();
process();
return 0;
}

```

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