求问一道编程题

Question

给定字符串A和B，输出A和B中的第一个最长公共字符串。比如A=“wepiabc”B="pabcni",则输出“abc”，如何编程实现啊~

Answer 1

void find(char* str, int n, char*& start, int& length)
{
    char tmp;
    char* p = str;
    char* q;
    int len = 0;
    length=0;
    while(*p)
    {
        q = p+1;
        while(*q && *q == *p)
        {
            q++;
        }
        
        if(*p)
        {
            len = q - p;
        }
        else
        {
            len = q - p + 1;
        }
        
        if(len>length)
        {
            length = len;
            start = p;
        }
        
        p=q;
    }
}
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