28 lines
525 B
C++
28 lines
525 B
C++
#include <iostream>
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using namespace std;
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int num[10],ans,C;
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void cal(int p, int s)
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{
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if(p==32) return;
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int sum=s,i;
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for(i=0;i<8;i++) sum+=(num[i]>>p)&1;
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if((sum&1)!=((num[8]>>p)&1))
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{
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ans|=1<<p;
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sum=s;
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for(i=0;i<8;i++) sum+=((num[i]>>p)&1)^1;
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}
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cal(p+1,sum/2);
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}
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int main()
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{
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for(scanf("%d",&C);C--;)
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{
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for(int i=0;i<9;i++) scanf("%x",&num[i]);
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ans=0;
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cal(0,0);
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printf("%x\n",ans);
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}
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return 0;
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}
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