点击链接PAT甲级-AC全解汇总
题目：
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 [1,10?4?? ]. 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 (≤10?5?? ) 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
题意：
输入一堆数，返回第一个只出现了一次的数
我的代码：
#include<bits/stdc++.h>
using namespace std;int main()
{
int N,nums[100100]={
0},times[100100]={
0};cin>>N;for(int i=0;i<N;i++){
cin>>nums[i];times[nums[i]]++;}for(int i=0;i<N;i++){
if(times[nums[i]]==1){
cout<<nums[i]<<endl;return 0;}}cout<<"None"<<endl;return 0;
}