【練習03】 KMP 1005 剪花布條

簡單的KMP。

//模板開始#include <string>   #include <vector>   #include <algorithm>   #include <iostream>   #include <sstream>   #include <fstream>   #include <map>   #include <set>   #include <cstdio>   #include <cmath>   #include <cstdlib>   #include <ctime>#include<iomanip>#define SZ(x) (int(x.size()))using namespace std;int toInt(string s){istringstream sin(s); int t; sin>>t; return t;}template<class T> string toString(T x){ostringstream sout; sout<<x; return sout.str();}typedef long long int64;int64 toInt64(string s){istringstream sin(s); int64 t; sin>>t;return t;}template<class T> T gcd(T a, T b){ if(a<0) return gcd(-a, b);if(b<0) return gcd(a, -b);return (b == 0)? a : gcd(b, a % b);}//模板結束（通用部分）//【練習03】 KMP 1005 剪花布條#define ifs cin#define MAX_SIZE 1000005 * 2void getFail(char* P, int* f){int m = strlen(P);f[0] = 0;f[1] = 0;for(int i = 1; i < m; i++){int j = f[i];while(j && P[i] != P[j]){j = f[j];}f[i + 1]=P[i]==P[j]?j+1:0;}}int find(char* T, char*P, int*f){int count = 0;int n = strlen(T), m = strlen(P);getFail(P, f);int j = 0;for(int i = 0; i < n; i++){while(j && P[j] != T[i]){j = f[j];}if(P[j] == T[i]){j++;}if(j == m){count++;j = 0;continue;}}return count;}int main(){//ifstream ifs("shuju.txt", ios::in);int result;int n, m;char* P = new char[MAX_SIZE];int* f = new int[MAX_SIZE];char* T = new char[MAX_SIZE];while(ifs>>T && T[0] != '#'){memset(f, 0, MAX_SIZE * sizeof(int));ifs>>P;result = find(T, P, f);cout<<result<<endl;}return 0;}