为何B类数会出错

BensonQAQ @ 2020-10-15 21:35:21

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
  int n,k,k1=0,k2=0,A=0,B=0;
  double s,t;
  cin>>n>>k;
  for(int i=1;i<=n;i++)
  {
    if(i%k==0)
    {
      k1+=i;
      A++;
    }
    else
    {
      k2+=i;
      B++;
    }
  }
  s=k1/A*1.00;
  t=k2/B*1.00;
  printf("%0.1f %0.1f",s,t);
  return 0;
}

by 李工男 @ 2020-10-17 10:06:16

平均数不对
s=k1/A1.00;
t=k2/B1.00;这样算的话是先除在乘，没有任何效果。
可以改成s=k11.00/A;t=k21.00/B;

修改后代码：

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
  int n,k,k1=0,k2=0,A=0,B=0;
  double s,t;
  cin>>n>>k;
  for(int i=1;i<=n;i++)
  {
    if(i%k==0)
    {
      k1+=i;
      A++;
    }
    else
    {
      k2+=i;
      B++;
    }
  }
  s=k1*1.00/A;
  t=k2*1.00/B;
  printf("%0.1f %0.1f",s,t);
  return 0;
}

by 周鸿远 @ 2020-10-23 21:08:11

#include <iostream>
#include <stdio.h>
using namespace std;
int n, k, sum;
int main () {
    scanf ("%d%d", &n, &k);
    for (int i = k; i <= n; i += k)
        sum += i;
    printf ("%.1f ", double (sum) / (n / k));
    sum = (1 + n) * n / 2 - sum;
    printf ("%.1f\n", double (sum) / (n - n / k));
    return 0;
}