1.链接:点击打开链接

2.代码:

#include<cstdio>
#include<iostream>
#include<cstring>
using namespace std; int a[100005];
int Hash[100000]; int main()
{
int n;
while(scanf("%d",&n)==1)
{
memset(Hash,0,sizeof(Hash));
for(int i=0; i<n; i++)
{
scanf("%d",&a[i]);
Hash[a[i]]++;
}
int flag=-1;
for(int i=0; i<n; i++)
{
if(Hash[a[i]]==1)
{
flag=i;
break;
} }
if(flag==-1)
printf("None\n");
else
printf("%d\n",a[flag]);
}
return 0;
}

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