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中级天翼
#include<iostream>
#include<cstdio>
using namespace std;
int main(){
int k,a=1;
double sum1=0,sum2=0,cnt=0;
cin>>k;
if(k%2==1){
while(a!=-1){
cin>>a;
if(a%2==1) sum1+=a;
}
cout<<sum1;
}
if(k%2==0){
while(a!=-1){
cin>>a;
cnt++;
if(a%2==0) sum2+=a;
}
printf("%.2f",sum2/cnt);
}
return 0;
}70分
