28 lines
552 B
C++
28 lines
552 B
C++
#include <iostream>
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#include <cstdlib>
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#include <cstdio>
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#include <algorithm>
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#include <iostream>
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#include <cstring>
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using namespace std;
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const int maxn = 10010;
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int cnt[maxn];
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int main()
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{
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int n;
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while(scanf("%d", &n) == 1)
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{
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memset(cnt, 0, sizeof(cnt));
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int ans = -1;
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for(int i = 0; i < n+1; i++)
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{
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int tmp;
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scanf("%d", &tmp);
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cnt[tmp]++;
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if(cnt[tmp] >= 2)
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ans = tmp;
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}
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printf("%d\n", ans);
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}
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}
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