剪花布条 HDU

一块花布条,里面有些图案,另有一块直接可用的小饰条,里面也有一些图案。对于给定的花布条和小饰条,计算一下能从花布条中尽可能剪出几块小饰条来呢?

Input输入中含有一些数据,分别是成对出现的花布条和小饰条,其布条都是用可见ASCII字符表示的,可见的ASCII字符有多少个,布条的花纹也有多少种花样。花纹条和小饰条不会超过1000个字符长。如果遇见#字符,则不再进行工作。
Output输出能从花纹布中剪出的最多小饰条个数,如果一块都没有,那就老老实实输出0,每个结果之间应换行。
Sample Input

abcde a3
aaaaaa  aa
#

Sample Output

0
3
#include <bits/stdc++.h>
#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<algorithm>
#include<queue>
#include<map>
#include<set>
#include<vector>
#include<iomanip>
using namespace std;
typedef long long ll;
const int inf = 0x3f3f3f3f;
const int mod = 998244353;
const double eps = 1e-8;
const int mx = 1005; //check the limits, dummy
typedef pair<int, int> pa;
const double PI = acos(-1);
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a * b / gcd(a, b); }
bool isprime(int n) { if (n <= 1)return 0; for (int i = 2; i * i <= n; i++)if (n % i == 0)return 0; return 1; }
#define swa(a,b) a^=b^=a^=b
#define re(i,a,b) for(int i=(a),_=(b);i<_;i++)
#define rb(i,a,b) for(ll i=(a),_=(b);i>=_;i--)
#define clr(a,b) memset(a, b, sizeof(a))
#define lowbit(x) ((x)&(x-1))
#define mkp make_pair
//inline ll qpow(ll a, ll b) { return b ? ((b & 1) ? a * qpow(a * a % mod, b >> 1) % mod : qpow(a * a % mod, b >> 1)) % mod : 1; }
//inline ll qpow(ll a, ll b, ll c) { return b ? ((b & 1) ? a * qpow(a * a % c, b >> 1) % c : qpow(a * a % c, b >> 1)) % c : 1; }
void ca(int kase, int ans) { cout << "Case #" << kase << ": " << ans << endl; }
void sc(int& x) { scanf("%d", &x); }void sc(int64_t& x) { scanf("%lld", &x); }void sc(double& x) { scanf("%lf", &x); }void sc(char& x) { scanf(" %c", &x); }void sc(char* x) { scanf("%s", x); }
int n, m, t, k;
char str[mx], pattern[mx];
int Next[mx];
int cnt;
void getFail(char* p, int plen) {
    Next[0] = 0, Next[1] = 0;
    re(i, 1, plen) {
        int j = Next[i];
        while (j && p[i] != p[j])j = Next[j];
        Next[i + 1] = (p[i] == p[j]) ? j + 1 : 0;
    }
}
void kmp(char* s, char* p) {
    int last = -1;
    int slen = strlen(s), plen = strlen(p);
    getFail(p,plen);
    int j = 0;
    re(i, 0, slen) {
        while (j && s[i] != p[j])j = Next[j];
        if (s[i] == p[j])j++;
        if (j == plen) {
            if (i - last >= plen)cnt++, last = i;
        }
    }
}
int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    
    while (cin >> str) {
        if (str[0] == '#')break;
        cin >> pattern;
        cnt = 0;
        kmp(str, pattern);
        cout << cnt << endl;
    }
    return 0;
}
原文地址:https://www.cnblogs.com/xxxsans/p/12887000.html