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1041 Be Unique (20 分)-PAT甲级

秀儿2020 2022-03-10 阅读 46
c++

Being unique is so important to people on Mars that even(甚至) their lottery(彩票) is designed in a unique way. The rule of winning is simple(简单的): one bets on a number chosen from [1,104]. The first one who bets on a unique number wins. For example, if there are 7 people betting on { 5 31 5 88 67 88 17 }, then the second one who bets on 31 wins.

Input Specification:

Each input file contains one test case. Each case contains a line which begins with a positive integer N (≤105) and then followed by N bets. The numbers are separated by a space.

Output Specification:

For each test case, print the winning number in a line. If there is no winner, print None instead.

Sample Input 1:

7 5 31 5 88 67 88 17

Sample Output 1:

31

Sample Input 2:

5 888 666 666 888 888

Sample Output 2:

None

AC代码

#include <iostream>
#include <vector>
#include <unordered_map> 
using namespace std;
int main()
{
	vector<int >a;
	unordered_map<int,int>b; 
	int n,temp;
	cin>>n;
	for(int i=0;i<n;i++)
	{
		cin>>temp;
		a.push_back(temp);
		b[temp]++;
	}
	bool flag=false;
	for(int i=0;i<a.size();i++)
	{
		if(b[a[i]]==1)
		{
			cout<<a[i];
			flag=true;
			break;
		}
	}
	if(!flag)
		cout<<"None"; 
	return 0;
}

 

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