HDU 4287 Intelligent IME hash

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本文介绍了一种基于手机智能输入法的匹配算法，通过建立数字与字母间的映射关系，统计给定数字序列能匹配到的单词数量。利用map进行预处理并存储转换后的字符串。

Intelligent IME

题目连接：http://acm.hdu.edu.cn/showproblem.php?pid=4287

Description

We all use cell phone today. And we must be familiar with the intelligent English input method on the cell phone. To be specific, the number buttons may correspond to some English letters respectively, as shown below:
　　2 : a, b, c 3 : d, e, f 4 : g, h, i 5 : j, k, l 6 : m, n, o
　　7 : p, q, r, s 8 : t, u, v 9 : w, x, y, z
　　When we want to input the word “wing”, we press the button 9, 4, 6, 4, then the input method will choose from an embedded dictionary, all words matching the input number sequence, such as “wing”, “whoi”, “zhog”. Here comes our question, given a dictionary, how many words in it match some input number sequences?

Input

First is an integer T, indicating the number of test cases. Then T block follows, each of which is formatted like this:
　　Two integer N (1 <= N <= 5000), M (1 <= M <= 5000), indicating the number of input number sequences and the number of words in the dictionary, respectively. Then comes N lines, each line contains a number sequence, consisting of no more than 6 digits. Then comes M lines, each line contains a letter string, consisting of no more than 6 lower letters. It is guaranteed that there are neither duplicated number sequences nor duplicated words.

Output

For each input block, output N integers, indicating how many words in the dictionary match the corresponding number sequence, each integer per line.

Sample Input

1
3 5
46
64448
74
go
in
night
might
gn

Sample Output

3
2
0

题意：给定N个包含数字的字符串和M个包含字母的字符串，每个数字对应一些字母，问N个字符串每个代表了多少个含字母的字符串。

题解：用map预处理数字和字母对应的关系，然后将每个字母的字符串转换后存在map中即可。

AC代码：

/*
* @Author: 王文宇
* @Date:   2018-06-26 02:10:52
* @Last Modified by:   王文宇
* @Last Modified time: 2018-06-26 02:43:02
*/
#include <bits/stdc++.h>
using namespace std;
#define _for(i,a,b) for(int i=a;i<=b;i++)
const int maxn = 5005;
int t,n,m;
string s[maxn];
map<int,int> H;
map<string,int> Q;
void intc()
{
	int k = 2;
	_for(i,0,25)
	{
		if(i==3||i==6||i==9||i==12||i==15||i==19||i==22||i==26)
		{
			k++;
		}
		H[i]=k;
	}
}
int main(int argc, char const *argv[])
{
	intc();
	cin>>t;
	while(t--)
	{
		Q.clear();
		cin>>n>>m;
		_for(i,1,n)cin>>s[i];
		string s2;
		_for(i,1,m)
		{
			cin>>s2;
			int l = s2.size()-1;
			_for(i,0,l)s2[i]=H[s2[i]-'a']+'0';
			Q[s2]++;
		}
		_for(i,1,n)cout<<Q[s[i]]<<endl;
	}
	return 0;
}