Init
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14
ACMOJ-1663.cpp
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14
ACMOJ-1663.cpp
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#include<iostream>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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int n,a,res=0; scanf("%d",&n);
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for(int i=0;i<n;i++) { scanf("%d",&a); res^=a; }
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printf("%d\n",res);
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return 0;
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}
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