PAT-A 1041. Be Unique
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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 17
Sample Output 1:
31
Sample Input 2:
5 888 666 666 888 888
Sample Output 2:
None
程序代码:
#include<stdio.h>#define MAX 100000int a[MAX];int b[10001]={0};int main(){ int n,i; scanf("%d",&n); for(i=0;i<n;i++) { scanf("%d",&a[i]); b[a[i]]++; } for(i=0;i<n;i++) { if(b[a[i]]==1) { printf("%d",a[i]); return 0; } } printf("None"); return 0; }
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