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WA了无数次，终于搞懂错在哪了，不是double的问题，加了几句后就AC了#include <iostream.H>
#include <math.h>
int main()
{
int k,n,i,j;
double d[10][100];
for(k=0;k<10;k++)
d[k][0]=1;
while(cin>>k>>n)
{
/* if(k==0)
{
cout<<"100.00000\n";
continue;
}此段若不加就总WA，测试了一下，若不加则输入0,100后程序直接退出*/
for(i=1;i<n;i++)
for(j=0;j<=k;j++)
if(!j) d[j][i]=d[j][i-1]+d[j+1][i-1];
else if(j==k) d[j][i]=d[j][i-1]+d[j-1][i-1];
else d[j][i]=d[j-1][i-1]+d[j][i-1]+d[j+1][i-1];
double sum=0;
for(i=0;i<=k;i++)
sum+=d[i][n-1];
sum*=100;
sum/=pow(k+1,n);
cout.setf(ios::fixed);
cout.precision(5);
cout<<sum<<endl;
}
return 0;
}
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