HDU2087 剪花布条

KMP 专栏6的I题

有空再写题解

#include <bits/stdc++.h>

using namespace std;

int nexxt[100];
void GetNext(char* p,int nexxt[]) {
	int pLen = strlen(p);
	nexxt[0] = -1;
	int k = -1;
	int j = 0;
	while (j < pLen - 1) {
		if (k == -1 || p[j] == p[k]) {
			++k;
			++j;
			nexxt[j] = k;
		} else {
			k = nexxt[k];
		}
	}
}

int KmpSearch(char* s, char* p) {
	int i = 0;
	int j = 0;
	int sLen = strlen(s);
	int pLen = strlen(p);
	int num = 0;
	while (i < sLen) {
		if (j == -1 || s[i] == p[j]) {
			i++;
			j++;
		} 
		else {
			j = nexxt[j];
		}
		if (j == pLen)
			num++;
	}
	return num;
}

int main() {
	char a[1005],b[1005];
	while(scanf("%s",a)!=EOF) {
		if(a[0] == '#') break;
		scanf("%s",b);
		GetNext(b,nexxt);
		int c = KmpSearch(a,b);
		printf("%d\n",c);
	}
}

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转载自blog.csdn.net/qq_41989228/article/details/80185446