如题所述
貌似有错误啊,大神哪里疏忽了?
#includeusing namespace std;int main(){ int i,j,n,sum,flag; while(true) { cin>>n; flag=1; sum=0; for(i=1,j=1;i<n+1;i++) { sum+=flag/j; flag=-flag; j=j+3; } cout<<sum<<endl; } return 0;}