http://acm.fzu.edu.cn/problem.php?pid=2024
#include < stdio.h >
#include < string .h >
#define M 1010
int c[M][M];
int f[M][M];
int min( int a, int b, int c)
{
int z = (a < b) ? a:b;
if (z < c) return z;
else return c;
}
int Max( int a , int b)
{
return a > b ? a:b;
}
void LCS( char aa[], char bb[], int x, int y)
{
int i,j;
for (i = 0 ;i <= x;i ++ )
c[i][ 0 ] = 0 ;
for (j = 0 ;j <= y;j ++ )
c[ 0 ][j] = 0 ;
for (i = 1 ;i <= x;i ++ )
for (j = 1 ;j <= y;j ++ )
{
if (aa[i - 1 ] == bb[j - 1 ]) c[i][j] = c[i - 1 ][j - 1 ] + 1 ;
else c[i][j] = Max(c[i][j - 1 ],c[i - 1 ][j]);
}
}
int main()
{
char a[M],b[M];
int L1,L2;
int t;
int k = 0 ;
scanf( " %d " , & t);
while (t -- )
{
scanf( " %s %s " ,a,b);
L1 = strlen(a);
L2 = strlen(b);
LCS(a,b,L1,L2);
int xx = c[L1][L2];
int ans = 0 ;
int i,j;
f[ 0 ][ 0 ] = 0 ;
for (i = 0 ;i <= L1;i ++ )
f[i][ 0 ] = i;
for (j = 0 ;j <= L2;j ++ )
f[ 0 ][j] = j;
for (i = 1 ;i <= L1;i ++ )
for (j = 1 ;j <= L2;j ++ )
{
if (a[i - 1 ] == b[j - 1 ]) // 转移方程
f[i][j] = f[i - 1 ][j - 1 ];
else f[i][j] = min(f[i - 1 ][j - 1 ] + 1 ,f[i - 1 ][j] + 1 ,f[i][j - 1 ] + 1 );
}
printf( " Case %d: LCS=%d EditStep=%d\n " , ++ k,xx,f[L1][L2]);
}
return 0 ;
}