题目如下：
Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is simple: 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 17Sample Output 1:
31Sample Input 2:
5 888 666 666 888 888Sample Output 2:
None
#include <iostream>
#include <map>
#include <vector>
#include <stdio.h>
using namespace std;
int main()
{
map<int,int> numMap;
vector<int> nums;
int N;
cin >> N;
int num;
for(int i = 0; i < N; i++){
scanf("%d",&num);
numMap[num]++;
nums.push_back(num);
}
num = - 1;
for(int i = 0; i < nums.size(); i++){
if(numMap[nums[i]] == 1){
num = nums[i];
break;
}
}
if(num == -1) cout << "None" << endl;
else cout << num << endl;
return 0;
}
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原文地址：http://blog.csdn.net/xyt8023y/article/details/46830301
