【练习03】 KMP 1002 Oulipo

来源：互联网发布：淘宝卖家怎么添加视频编辑：程序博客网时间：2024/06/08 01:58

只要把查找函数改一下就好了，当找到匹配即j==m的时候不要打印，而是count++;j = f[j];continue;

这三句的含义是把count更新完后，把当前的匹配当做失配处理，再沿着失配边继续寻找“下一个匹配”。

//模板开始#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);}//模板结束（通用部分）//【练习03】 KMP 1002 Oulipo#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 = f[j];continue;}}return count;}int main(){//ifstream ifs("shuju.txt", ios::in);int cases;int result;int n, m;char* P = new char[MAX_SIZE];int* f = new int[MAX_SIZE];char* T = new char[MAX_SIZE];char* temp = new char[5];ifs>>cases;ifs.getline(temp, MAX_SIZE, '\n');//过滤掉换行符for(int i = 0; i < cases; i++){memset(f, 0, MAX_SIZE * sizeof(int));ifs.getline(T, MAX_SIZE, '\n');ifs.getline(P, MAX_SIZE, '\n');result = find(P, T, f);cout<<result<<endl;}return 0;}