Problem Description
A subsequence of a given sequence is the given sequence with
some elements (possible none) left out. Given a sequence X =
<x1, x2, ..., xm> another sequence Z
= <z1, z2, ..., zk> is a subsequence
of X if there exists a strictly increasing sequence
<i1, i2, ..., ik> of indices of X
such that for all j = 1,2,...,k, xij = zj. For example, Z =
<a, b, f, c> is a subsequence of X =
<a, b, c, f, b, c> with index
sequence <1, 2, 4, 6>. Given two
sequences X and Y the problem is to find the length of the
maximum-length common subsequence of X and Y.
The program input is from a text file. Each data set in the file contains two strings representing the given sequences. The sequences are separated by any number of white spaces. The input data are correct. For each set of data the program prints on the standard output the length of the maximum-length common subsequence from the beginning of a separate line.
The program input is from a text file. Each data set in the file contains two strings representing the given sequences. The sequences are separated by any number of white spaces. The input data are correct. For each set of data the program prints on the standard output the length of the maximum-length common subsequence from the beginning of a separate line.
Sample Input
abcfbc abfcab
programming contest
abcd mnp
programming contest
abcd mnp
Sample Output
4 2 0
# include<stdio.h>
# include<string.h>
int num[1001][1001];
int main()
{
int i,j,len1,len2,a,b;
char s1[1000],s2[1000];
while(scanf("%s%s",s1+1,s2+1)!=EOF)
{
len1=strlen(s1+1);
len2=strlen(s2+1);
for(i=0;i<len1+1;i++)
num[i][0]=0;
for(i=0;i<len2+1;i++)
num[0][i]=0;
for(i=1;i<=len1;i++)
for(j=1;j<=len2;j++)
{
if(s1[i]==s2[j])
num[i][j]=num[i-1][j-1]+1;
else
{
a=num[i][j-1];
b=num[i-1][j];
if(a>b)
num[i][j]=a;
else
num[i][j]=b;
}
}
printf("%d\n",num[len1][len2]);
}
return 0;
}