why 5wa?

Tarshine @ 2023-03-27 15:07:53

#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,k,sum1=0,sum2=0;
double ave1,ave2;
cin>>n>>k;
for(int i=k;i<=n;i+=k) sum1+=i;
sum2=(n+1)*n/2-sum1;
ave1=sum1/(n/k);
ave2=sum2/(n-n/k);
cout<<fixed<<setprecision(1)<<ave1<<" "<<ave2;
return 0;
}

by manyc @ 2023-04-02 14:36:23

@Tu15879030589 你可能中间转换出了点问题，我没细看，ACcode:

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    int n,k;
    double a=0.0,b=0.0,ai=0.0,bi=0.0;
    cin>>n>>k;
    for(int i=1;i<=n;i++){
        if(i%k==0){
            a+=double(i);
            ai+=1.0;
        }else{
            b+=double(i);
            bi+=1.0;
        }
    }
    cout<<fixed<<setprecision(1)<<a/ai<<" ";
    cout<<fixed<<setprecision(1)<<b/bi;
    return 0;
}