【KMP】 HDU 2594 Simpsons’ Hidden Talents

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KMP中最后 j 的位置是S串的前缀位置

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <string>
#include <iostream>
#include <algorithm>
#include <sstream>
#include <cmath>
using namespace std;
#include <queue>
#include <stack>
#include <vector>
#include <deque>
#define cler(arr, val) memset(arr, val, sizeof(arr))
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define IN freopen ("in.txt" , "r" , stdin);
#define OUT freopen ("out.txt" , "w" , stdout);
typedef long long LL;
const int MAXN = 60000;
const int MAXM = 6000010;
const int INF = 0x3f3f3f3f;
const LL mod = 10e9+7;
const double eps= 1e-8;
#define lson l,m, rt<<1
#define rson m+1,r,rt<<1|1
int next[MAXN];
char s[MAXN],c[MAXN];
void getnext(int len)
{
int i=0,j=-1;
next[0]=j;
while(i<len)
{
if(j==-1||s[i]==s[j])
i++,j++,next[i]=j;
else j=next[j];
}
}
int KMP(int len,int len2)
{
int i=0,j=0;
if(len<len2) i=len2-len;
while(j<len&&i<len2)
{
if(j==-1||c[i]==s[j])
{
i++;
j++;
}
else
j=next[j];
}
return j;
}
int input()
{
if(cin>>s>>c) return 1;
return 0;
}
int solve()
{
int len=strlen(s);
int len2=strlen(c);
getnext(len);
int ans=KMP(len,len2);
if(ans==0)
cout<<0<<endl;
else cout<<c+len2-ans<<" "<<ans<<endl;
}
int main()
{
while(input())
solve();
return 0;
}