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Description
Input
Output
Sample Input
abcd aaaa ababab .
Sample Output
1 4 3
Hint
This problem has huge input, use scanf instead of cin to avoid time limit exceed.
题意:求子串在源字符串出现的最大次数
总结一下,如果对于next数组中的 i, 符合 i % ( i - next[i] ) == 0 && next[i] != 0 , 则说明字符串循环,而且
循环节长度为: i - next[i]
循环次数为: i / ( i - next[i] ) //算次数不需要next[i] != 0这个条件
#include<cstdio>
#include<cstring>
#define MAX 1000100
char str[MAX];
int next[MAX];
int len;
void Get_Next()
{
int i=0,j=-1;
next[0]=-1;
while(i<len)
{
if(j==-1 || str[i]==str[j])
{
++i,++j;
next[i]=j;
}
else
j=next[j];
}
}
int main()
{
while(scanf("%s",str),strcmp(str,"."))
{
len=strlen(str);
Get_Next();
if((len)%((len)-next[len])==0)
printf("%d\n",(len)/((len)-next[len]));
else printf("1\n");
}
return 0;
}
#include<cstdio>
#include<cstring>
#define MAX 1000100
char str[MAX];
int next[MAX];
int len;
void Get_Next()
{
int i=0,j=-1;
next[0]=-1;
while(i<len)
{
if(j==-1 || str[i]==str[j])
{
++i,++j;
next[i]=j;
}
else
j=next[j];
}
}
int main()
{
while(scanf("%s",str),strcmp(str,"."))
{
len=strlen(str);
Get_Next();
(len)%((len)-next[len])==0&&next[len]!=0?printf("%d\n",(len)/((len)-next[len])):printf("1\n");
}
return 0;
}版权声明:本文为博主原创文章,未经博主允许不得转载。
Power Strings POJ 2406【KMP Next的应用】
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原文地址:http://blog.csdn.net/yuzhiwei1995/article/details/47341965