kuangbin专题十六 KMP&&扩展KMP HDU2087 剪花布条
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 kmp裸题,不同的是不能重叠。
不能重叠 j=0 重叠的话是 j=Next[j]
比较好理解。因为不重叠就当前i和j=0 重叠就是当前i和Next[j],前面部分重叠(i之前的k个)
#include<stdio.h>
#include<string.h>
int Next[],n,m,tlen,plen;
char t[],p[]; void prekmp() {
int i,j;
tlen=strlen(t);
plen=strlen(p);
j=Next[]=-;
i=;
while(i<plen) {
while(j!=-&&p[i]!=p[j]) j=Next[j];
if(p[++i]==p[++j]) Next[i]=Next[j];
else Next[i]=j;
}
} int kmp() {
prekmp();
int i,j,ans=;
i=j=;
while(i<tlen) {
while(j!=-&&t[i]!=p[j]) j=Next[j];
i++;j++;
if(j>=plen) {
ans++;
j=;//不重叠
}
}
return ans;
} int main() {
while(~scanf("%s",t)) {
if(t[]=='#') break;
scanf("%s",p);
printf("%d\n",kmp());
}
}
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