#include<stdio.h>
int main()
{
int max,min,n,i,x,t,a[10001],sum1,sum2,s;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
max=0;
min=10001;
s=0;
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
if(a[i]>max)
max=a[i];
if(a[i]<min)
min=a[i];
if(a[i]>=n&&a[i]<0)s=1;
}
if(s==1||n==1&&max==0){ printf("Impossible!\n"); continue;}
sum1=sum2=0;
if(max==min+1){
for(i=0;i<n;i++){
if(max==a[i])sum1++;
else sum2++;
}
if(sum2==max)printf("%d\n",max);
else printf("Impossible!\n");
}
else if(max==min)
{ if(max==0)printf("0\n");
else {
if(max==n-1)printf("%d\n",n);
else printf("Impossible!\n"); }
}
else
printf("Impossible!\n");
}
}这题是在组队时候做的！需要考虑很多情况！特别 0 和 1 ！！
http://acm.hdu.edu.cn/showproblem.php?pid=2690
posted on 2009-04-29 21:01
zhoubaozhong 阅读(230)
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