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已解决
#include<iostream>
#include<algorithm>
#include<iomanip>
#include<string>
#include<cstdio>
using namespace std;
int n;
int a[505];
double sum=0.0;
int main(){
cin>>n;
for(int i=1;i<=n;i++){
cin>>a[i];
if(a[i]==0){
sum+=0.0;
}
if(a[i]<=70){
sum+=0.1;
}
else{
double m=(a[i]+69)/70;
sum+=m*0.1;
}
}
printf("%.1f",sum);
return 0;
}