PAT-1041. Be Unique (20)

Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is 易做图: 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

分析：（1）直接用查询表。（2）用cin输入会超时，但是用scanf输入可以通过。

参考代码：

 

#include<iostream>  
#include<cstdio>  
#include<string.h>  
using namespace std;  
int result[10000 + 5];  
int input[100000 + 5];  
int main()  
{  
    int n;  
    cin>>n;  
    int i;  
    int temp;  
    bool flag = false;  
  
    for(i=0; i<n; i++)  
    {  
        //cin>>input[i];   用cin会超时, 用scanf不会  
        scanf("%d",&input[i]);  
        result[ input[i] ]++;  
    }  
  
    for(i=0; i<n; i++)  
    {  
        if(result[ input[i] ] == 1)  
        {  
            flag = true;  
            break;  
        }  
    }  
    if(flag)  
        cout<<input[i]<<endl;  
      
    else  
        cout<<"None"<<endl;  
    return 0;  
}  

 

 

补充：软件开发 , C++ ,