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NOIP1998阅读程序写结果 普及组3.2

/#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)/2return s1;

}

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

答案：S=

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