CodeForces 4C Registration systems-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_21057881/article/details/50951570

本文介绍了一个简单的字符串注册系统的实现方法，使用C++编程语言和map数据结构来处理重复用户名的问题，确保每个用户都能成功注册。

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题意：输入一系列字符串，如果之前没出现过则输出OK，如果之前输出过，则输出这个字符串+出现的次数在后面

思路：用map随便搞搞

#include <cstdio>
#include <queue>
#include <cstring>
#include <iostream>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <map>
#include <string>
#include <set>
#include <ctime>
#include <cmath>
#include <cctype>
using namespace std;
#define maxn 100000
#define LL long long
int cas=1,T;
int main()
{
	int n;
	while (scanf("%d",&n)!=EOF)
	{
        map<string,int>s;
        for (int i = 1;i<=n;i++)
		{
			string s1;
			cin >> s1;
			if (!s.count(s1))
			{
				s[s1]++;
				puts("OK");
			}
			else
			{
				cout << s1 << s[s1]++ << endl;
			}
		}
	}
	//freopen("in","r",stdin);
	//scanf("%d",&T);
	//printf("time=%.3lf",(double)clock()/CLOCKS_PER_SEC);
	return 0;
}

Description

A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.

Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1,name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.

Input

The first line contains number n (1 ≤ n ≤ 10⁵). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.

Output

Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.

Sample Input

Input