hdu 4161 Iterated Difference
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水题~~
代码:
#include<stdio.h>
#include<math.h>
int main()
{
int n,a[25],r,i,num,ans=0;
while(scanf("%d",&n)!=EOF,n)
{
ans++;
for(i=0;i<n;i++)scanf("%d",&a[i]);
/*for(i=0;i<n;i++)if(a[0]!=a[i])break;
if(i==n)
{
printf("Case %d: 0 iterations\n",ans);
continue;
}*/
for(num=0;num<=1000;num++)
{
r=a[0];
for(i=0;i<n-1;i++)
{
a[i]=abs(a[i+1]-a[i]);
}
a[i]=abs(a[i]-r);
/*for(i=0;i<n;i++)
printf("%d ",a[i]);
printf("\n\n");
for(i=0;i<n;i++)if(a[0]!=a[i])break;
if(i==n)break;*/
for(i=0;i<n;i++)if(a[i])break;
if(i==n)break;
}
printf("Case %d: ",ans);
if(num>1000)printf("not attained\n");
else
printf("%d iterations\n",num);
}
return 0;
}
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