A - Phone Number

本文介绍了一种解决电话号码前缀冲突的问题,通过排序和查找的方法,判断一组电话号码中是否存在不能拨打的情况。

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Description

We know that if a phone number A is another phone number B’s prefix, B is not able to be called. For an example, A is 123 while B is 12345, after pressing 123, we call A, and not able to call B.
Given N phone numbers, your task is to find whether there exits two numbers A and B that A is B’s prefix.

Input

 The input consists of several test cases.
 The first line of input in each test case contains one integer N (0<N<1001), represent the number of phone numbers.
 The next line contains N integers, describing the phone numbers.
 The last case is followed by a line containing one zero.

Output

 For each test case, if there exits a phone number that cannot be called, print “NO”, otherwise print “YES” instead.

Sample Input

2
012
012345
2
12
012345
0

Sample Output

NO
YES

题意:

类似于在STL专题 中做过的题,即给你几组字符串,寻找里面是否有一组是另一组的 前缀,即给你几个字符串,让你寻找是否有包含的关系,即某一字符串是不是为另一字符串的子串。

思路:

对字符串进行排序,排序完之后,注意 此时可以find函数来寻找是否有包含关系,即v[i+1].find(v[i]);即在v[i+1]里面看能否找到v[i],如果找到则为0,输出“NO”,运用标识符,判断"YES"的情况。

代码:

#include<bits/stdc++.h>
using namespace std;
int main()
{
	vector<string>v;
	string s;
	int n,i,j,k;
	while(cin>>n)
		{
		    if(n==0)
		    break;
        int flag=0;
		v.clear();
		for(i=0;i<n;i++)
		{
		    cin>>s;
			v.push_back(s);
		}
		sort(v.begin(),v.end());
		for(j=0;j<n-1;j++)
		{
			if(v[j+1].find(v[j])==0)
			{
				flag++;
				}
			}
			
               if(flag==0)
			 cout<<"YES"<<endl;
			 else       cout<<"NO"<<endl;
		}

		return 0;
	}



细节:

注意STL的运用,采用find函数,省事省力!

(Telephone Number Word Generator) Standard telephone keypads contain the digits 0 through 9. The numbers 2 through 9 each have three letters associated with them, as is indicated by the following table: Many people find it difficult to memorize phone numbers, so they use the correspondence between digits and letters to develop seven-letter words that correspond to their phone numbers. For example, a person whose telephone number is 686-2377 might use the correspondence indi- cated in the above table to develop the seven-letter word “NUMBERS.” Businesses frequently attempt to get telephone numbers that are easy for their clients to remember. If a business can advertise a simple word for its customers to dial, then no doubt the business will receive a few more calls. Each seven-letter word corresponds to exactly one seven-digit telephone number. The restaurant wishing to increase its take-home business could surely do so with the number 825-3688 (i.e., “TAKEOUT”). Each seven-digit phone number corresponds to many separate seven-letter words. Unfortunately, most of these represent unrecognizable juxtaposi- tions of letters. It’s possible, however, that the owner of a barber shop would be pleased to know that the shop’s telephone number, 424-7288, corresponds to “HAIRCUT.” A veterinarian with the phone number 738-2273 would be happy to know that the number corresponds to “PETCARE.” Write a program that, given a seven-digit number, writes to a file every possible seven-letter word corresponding to that number. There are 2187 (3 to the seventh power) such words. Avoid phone numbers with the digits 0 and 1.
06-09
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