41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
#include<stdio.h>
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int main()
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{
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int max,min,n,i,x,t,a[10001],sum1,sum2,s;
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scanf("%d",&t);
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while(t--)
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{
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scanf("%d",&n);
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max=0;
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min=10001;
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s=0;
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for(i=0;i<n;i++)
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{
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scanf("%d",&a[i]);
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if(a[i]>max)
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max=a[i];
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if(a[i]<min)
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min=a[i];
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if(a[i]>=n&&a[i]<0)s=1;
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}
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if(s==1||n==1&&max==0){ printf("Impossible!\n"); continue;}
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sum1=sum2=0;
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if(max==min+1){
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for(i=0;i<n;i++){
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if(max==a[i])sum1++;
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else sum2++;
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}
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if(sum2==max)printf("%d\n",max);
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else printf("Impossible!\n");
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}
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else if(max==min)
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{ if(max==0)printf("0\n");
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else {
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if(max==n-1)printf("%d\n",n);
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else printf("Impossible!\n"); }
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}
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else
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printf("Impossible!\n");
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}
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}
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