标签:
Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 102400/204800 K (Java/Others)
Total Submission(s): 20680 Accepted Submission(s): 6852
题目链接:HDU 1075
结构体Trie中用flag=1表示当前点是否是某个单词的结尾处(防止出现单词a为单词b的前缀但是却被b覆盖的情况,比如diff对应bbb,但是此时diff的前缀dif显然是不存在的),若为结尾,则flag赋值为1,然后把对应的翻译单词赋值给这个节点的s[]。
查询的是否看查完之后的flag是否为1,如果为1则存在该单词,否则flag为0或根本查不到,则返回NULL
一开始智障了把每个点flag都设为1狂WA……
代码:
#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <sstream>
#include <cstring>
#include <bitset>
#include <string>
#include <deque>
#include <stack>
#include <cmath>
#include <queue>
#include <set>
#include <map>
using namespace std;
#define INF 0x3f3f3f3f
#define CLR(x,y) memset(x,y,sizeof(x))
#define LC(x) (x<<1)
#define RC(x) ((x<<1)+1)
#define MID(x,y) ((x+y)>>1)
typedef pair<int,int> pii;
typedef long long LL;
const double PI=acos(-1.0);
const int N=26;
const int M=100;
struct Trie
{
Trie *nxt[N];
int flag;
char s[M];
Trie()
{
CLR(nxt,0);
CLR(s,0);
flag=0;
}
};
Trie *L=new Trie();
void update(char s[],char earth[])
{
int len=strlen(s);
int indx;
Trie *cur=L;
for (int i=0; i<len; ++i)
{
indx=s[i]-‘a‘;
if(cur->nxt[indx])
cur=cur->nxt[indx];
else
{
Trie *one=new Trie();
cur->nxt[indx]=one;
cur=one;
}
}
strcpy(cur->s,earth);
cur->flag=1;
}
char* Find(char s[])
{
int len=strlen(s);
int indx;
Trie *cur=L;
for (int i=0; i<len; ++i)
{
indx=s[i]-‘a‘;
if(cur->nxt[indx]==NULL)
return NULL;
cur=cur->nxt[indx];
}
return cur->flag?cur->s:NULL;
}
char from[M],to[M];
char tot[1000010];
char temp[M];
int main(void)
{
int i;
scanf("%s",from);
getchar();
while (~scanf("%s",to)&&strcmp(to,"END"))
{
scanf("%s",from);
update(from,to);
}
getchar();
gets(from);
while (gets(tot)&&strcmp(tot,"END"))
{
int len=strlen(tot);
int k=0;
CLR(temp,0);
for (i=0; i<len; ++i)
{
if(islower(tot[i]))
temp[k++]=tot[i];
else
{
char *one=Find(temp);
if(k)
printf("%s",one==NULL?temp:one);
putchar(tot[i]);
CLR(temp,0);
k=0;
}
}
if(k)
{
char *one=Find(temp);
printf("%s",one==NULL?temp:one);
}
putchar(‘\n‘);
}
return 0;
}
HDU 1075 What Are You Talking About(Trie的应用)
标签:
原文地址:http://www.cnblogs.com/Blackops/p/5908836.html