21 lines
310 B
C++
21 lines
310 B
C++
#include<cstdio>
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using namespace std;
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int main()
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{
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bool isc[1001]={0};
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int x,n;
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scanf("%d",&n);
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for(int i=0;i<n;i++)
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{
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scanf("%d",&x);
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isc[x]=1;
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}
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int ans=0;
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for(int i=0;i<1001;i++) ans+=isc[i];
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printf("%d\n",ans);
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for(int i=0;i<1001;i++) if(isc[i]) printf("%d ",i);
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printf("\n");
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return 0;
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}
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