求n以内的完全数#include<iostream>#include<math.h>using namespace std;int f(int n){int b=0,i,c=0; for(i=1;i<n;i++) {if(n%i==0) c+=i; } return c;}int main(){int j,n; int k=0; cin>>n; for(int j=2;j<n;j++) {if(f(j)==j) {++k; while(k>1){cout<<" ";break;} cout<<j;}} return 0;}