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NOIP1998阅读程序写结果 普及组3.2
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#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
const int n=10;
int s;
int co(int i1) //2 //c(n,m)=n!/(m!*(n-m)!)
{
int j1,s1;
s1=n; //s1=10

for(int j1=n-1;j1>=n-i1+1;--j1)  //j1=9  j1=9  c(10,i1)
    s1=(s1*j1)/(n-j1+1);  //s1=(10*9)/2

return s1;  

}
int main()
{
s=n+1; //11
for(int i=2;i<=n;i++)
{
//cout<<" "<<co(i)<<endl;
s=s+co(i);
}
printf("S=%d",s);
}
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答案：S=
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