HDU 2594 Simpsons’ Hidden Talents KMP

标签：space   class   system   lan   i++   main   max   oid   hdu   

#include<iostream>
#include<string>
using namespace std;

void getNext(string s, int *nex)
{
    nex[0] = -1;
    int i = 0, j = -1;
    int len = s.length();
    while(i < len)
    {
        if(j == -1 || s[i] == s[j])
        {
            i++, j++;
            nex[i] = j;
        }
        else j = nex[j];
    }
}

int max(int a, int b) { return a > b ? a : b;}

int KMP(string s1, string s2, int *nex)
{
    int len1 = s1.length();
    int i = 0, j = 0;
    while(i < len1)
    {
        if(s1[i] == s2[j] || j == -1)
            i++, j++;
        else j = nex[j];
    }
    return max(j-1, 0);
}

int main()
{
    string s1, s2;
    while(getline(cin, s1))
    {
        int nex[60000];
        getline(cin, s2);
        //cout << s2 << endl;
        getNext(s1, nex);
        int len = KMP(s2, s1, nex);
        if(len == 0) printf("0\n");
        else
        {
            for(int i = 0; i < len+1; i++) printf("%c", s1[i]);
            printf(" %d\n", len+1);
        }
    }
    system("pause");
    return 0;
}

HDU 2594 Simpsons’ Hidden Talents KMP

标签：space   class   system   lan   i++   main   max   oid   hdu   

原文地址：https://www.cnblogs.com/znk97/p/14043952.html