#include<stdio.h> int main(){//0异或任何数都是任何事 int t,i; scanf("%d",&t); while(t--){ int n; scanf("%d",&n); int a[n]; for(i=0;i<n;i++) scanf("%d",&a[i]); int s=0; for(i=0;i<n;i++) s^=a[i]; printf("%d\n",s); } } |
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