#includeusingnamespacestd;__int64fac(intn){if(n==0||n==1)return1;retur
#include<iostream>usingnamespacestd;__int64fac(intn){if(n==0||n==1)return1;returnn*fac(n-1);}intmain(){inti;__int64sum=0;for(i=1;i<=5;i++){sum+=fac(i);}cout<<"sum1!+...+5!="<<sum<<endl;return0;}
是5！+4！+...1！吗??
最多设置5个标签!
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是5！+4！+...1！吗??