UVa 10975 - Dueue's Quiz
题目：给你一些单词组成一个字典，然后再给你一个由字母组成的矩阵，连接横、竖和斜线可以组成单词。
统计字典中，每个单词出现的次数。
分析：字符串、字典树（Trie）、AC自动机。单词统计问题，一定想到字典树和AC自动机。
首先，将字典存入字典树（可以在字典树上构造AC自动机，加快查询）
然后，枚举每条直线上的单词查询计数（AC自动机，只要输入最长串即可）
最后，遍历字典树（或AC自动机）输出统计结果。
注意：单词是单个字母时，要统计8次。
代码，字典树（Trie）版：
#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
using namespace std;
char word[15005][1005];
int C[15005];
/* Trie define */
#define nodesize 400004 //节点个数
#define dictsize 26 //字符集大小
typedef struct node1
{
int flag; //值域
node1* next[dictsize];
}tnode;
tnode dict[nodesize];
int ID[256];
class Trie
{
private:
int size;
tnode* root;
char cput[105];
public:
Trie() {makeID(); initial();}
void makeID() {
for ( int i = 0 ; i < 26 ; ++ i )
ID['a'+i] = i;
}
void initial() {
memset( dict, 0, sizeof( dict ) );
root=NULL; size=0; root=newnode();
}
tnode* newnode() {return &dict[size ++];}
void insert( char* word, int l, int id ) {
tnode* now = root;
for ( int i = 0 ; i < l ; ++ i ) {
if ( !now->next[ID[word[i]]] )
now->next[ID[word[i]]] = newnode();
now = now->next[ID[word[i]]];
}now->flag = id;
}
void query( char* word, int L ) {//统计字串出现个数0
tnode* now = root;
for ( int i = 0 ; i < L ; ++ i ) {
if ( !now->next[ID[word[i]]] ) return;
now = now->next[ID[word[i]]];
}if ( now->flag ) C[now->flag] ++;
}
void output(){output( root, 0 );}
void output( tnode* now, int d ) {
if ( C[now->flag] ) {
for ( int i = 0 ; i < d ; ++ i )
printf("%c",cput[i]);
printf(" %d\n",C[now->flag]);
}
for ( int i = 0 ; i < 26 ; ++ i )
if ( now->next[i] ) {
cput[d] = 'a'+i;
output( now->next[i], d+1 );
}
}
}trie;
/* Trie end */
char maps[105][105];
char save[105];
int d[8][2] = {{0,1},{1,0},{-1,0},{0,-1},{1,1},{-1,1},{1,-1},{-1,-1}};
int main()
{
int T,n,m,r,c,x,y,count,L,t,i,j,k,a;
while ( ~scanf("%d",&T) )
for ( t = 1 ; t <= T ; ++ t ) {
scanf("%d",&n);
for ( i = 1 ; i <= n ; ++ i )
scanf("%s",word[i]);
trie.initial();
for ( i = 1 ; i <= n ; ++ i ) {
L = strlen(word[i]);
if ( L < 101 ) trie.insert( word[i], L, i );
}
printf("Test Case #%d\n",t);
scanf("%d",&m);
for ( k = 1 ; k <= m ; ++ k ) {
printf("Query #%d\n",k);
scanf("%d%d",&r,&c);
for ( i = 0 ; i < r ; ++ i )
scanf("%s",maps[i]);
memset( C, 0, sizeof(C) );
for ( i = 0 ; i < r ; ++ i )
for ( j = 0 ; j < c ; ++ j )
for ( a = 0 ; a < 8 ; ++ a ) {
int count = 0,X = i,Y = j;
while ( 1 ) {
if ( X < 0 || X >= r || Y < 0 || Y >= c ) break;
save[count ++] = maps[X][Y];
trie.query( save, count );
X = X + d[a][0];
Y = Y + d[a][1];
}
}trie.output();
}printf("\n");
}
return 0;
}
测试数据：
4 4 hello bye one two 2 3 3 bye okk res 3 3 one wzq too 4 hello madam hello madam 1 6 6 helloh oezxec lnllbv lmllas eogfod hmadam 6 x xx xxx xxxxxxxxx xxxxxxxxxx xxxxxxxxxxx 15 1 1 x 1 2 xx 1 3 xxx 2 1 x x 2 2 xx xx 2 3 xxx xxx 3 1 x x x 3 2 xx xx xx 3 3 xxx xxx xxx 4 4 xxxx xxxx xxxx xxxx 5 5 xxxxx xxxxx xxxxx xxxxx xxxxx 10 1 x x x x x x x x x x 1 10 xxxxxxxxxx 10 10 xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx xxxxxxxxxx 100 100 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 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