POJ 3461 Oulipo KMP模板题

找来测代码

//#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<iostream>
#include<sstream>
#include<cmath>
#include<climits>
#include<string>
#include<map>
#include<queue>
#include<vector>
#include<stack>
#include<set>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb(a) push_back(a)
#define INF 0x1f1f1f1f
#define lson idx<<1,l,mid
#define rson idx<<1|1,mid+1,r
#define PI  3.1415926535898
template<class T> T min(const T& a,const T& b,const T& c) {
    return min(min(a,b),min(a,c));
}
template<class T> T max(const T& a,const T& b,const T& c) {
    return max(max(a,b),max(a,c));
}
void debug() {
#ifdef ONLINE_JUDGE
#else

    freopen("d:\\in.txt","r",stdin);
   // freopen("d:\\out1.txt","w",stdout);
#endif
}
int getch() {
    int ch;
    while((ch=getchar())!=EOF) {
        if(ch!=' '&&ch!='\n')return ch;
    }
    return EOF;
}

//kmp
const int MAX_STR_LEN=11000;
void GetNext(const char *s,int *next)
{
    next[0]=next[1]=0;
    for(int i=1;s[i]!='\0';i++)
    {
        int j=next[i];
        if(j&&s[j]!=s[i])j=next[j];
        next[i+1]=s[j]==s[i]?j+1:0;
    }
}
int kmp(const char *s,const char *sub)
{
    int next[MAX_STR_LEN];
    GetNext(sub,next);
    int num=0;
    int j=0;
    for(int i=0;s[i]!='\0';)
    {
        if(s[i]==sub[j])
        {
            i++,j++;
            if(sub[j]=='\0')
            {
                    num++;
                    j=next[j];
            }
        }else if(j==0) i++;
        else j=next[j];
    }
    return num;
}

char str[1001000];
char word[MAX_STR_LEN];
int main()
{
    int t;
    scanf("%d",&t);
    for(int ca=1;ca<=t;ca++)
    {
        scanf("%s%s",word,str);
        int num=kmp(str,word);
        printf("%d\n",num);
    }
    return 0;
}