找出两个字符串中最大公共子字符串,如"abccade","dgcadde"的最大子串为"cad"

#include <iostream.h>
#include <string>
int GetCommon(char *s1, char *s2, char **r1, char **r2)
{
int len1 = strlen(s1);
int len2 = strlen(s2);
int maxlen = 0;

for(int i = 0; i < len1; i++)
{
for(int j = 0; j < len2; j++)
{
if(s1[i] == s2[j])
{
int as = i, bs = j, count = 1;
while(as + 1 < len1 && bs + 1 < len2 && s1[++as] == s2[++bs])
count++;
if(count > maxlen)
{
maxlen = count;
*r1 = s1 + i;
*r2 = s2 + j;
}
}
}
}
return maxlen;
}
void main()
{
char *r1,*r2;
char *str1="nbasdfghjkl",*str2="asdfgbhjnmk";
cout<<GetCommon(str1,str2,&r1,&r2);
for(int i=0;i<GetCommon(str1,str2,&r1,&r2);i++)
cout<<*(r2+i);
}