30分求解

Future_Comet @ 2024-08-22 13:48:28

#include<bits/stdc++.h>
using namespace std;
int n;
float sum,a[310],ans;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>a[i];
    sort(a+1,a+n+1);
    for(int i=2;i<n;i++)
        sum+=a[i];
    sum/=n-2;
    ans=max(sum-a[1],a[n]-sum);
    printf("%.2lf %.2lf",sum,ans);
    return 0;
}

by giao_nice @ 2024-08-22 13:51:07

@Future_Comet sum/=n-2没加括号，应为sum/=(n-2)

by giao_nice @ 2024-08-22 13:53:56

还有，这个代码并没有过样例，在题目中说是有效样本去求ans，所以应该是ans=max(sum-a[2],a[n-1]-sum);

by wanchenhao @ 2024-08-22 13:54:47

@Future_Comet

AC代码求关

#include <bits/stdc++.h>
using namespace std;
double a[310];
double cnt, m, w, p;
int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (int i = 1; i < n; i++) {
        for (int j = 1; j < n; j++) {
            if (a[j] >= a[j+1]) {
                swap(a[j], a[j + 1]);
            }
        }
    }
    m = a[n-1];
    for (int i = 2; i < n; i++) {
        cnt+=a[i];
    }
    p=cnt/(n-2);
    double w=-1,q;
    for(int i=2;i<n;i++){
        q=fabs(a[i]-p);
        if(q>=w){
            w=q;
        }
    }
    printf("%.2f %.2f",p,w);
    return 0;
}

by wanchenhao @ 2024-08-22 13:55:36

@Future_Comet

用你的代码调的

by Future_Comet @ 2024-08-22 14:00:33

牛逼，感谢大佬

by Future_Comet @ 2024-08-22 14:01:50

@giao_nice 大佬，刚才我自己提交了一下，括号不加好像也行

by giao_nice @ 2024-08-22 14:12:53

@Future_Comet 你对比一下10/5-2he10/(5-2)的区别，你就知道括号的重要性

by Future_Comet @ 2024-08-22 18:41:34

@giao_nice 对不起下午有事出去了没看回复

我记得好像sum/=n-2是先运算n-2再运算sum/=...的吧？

如大佬还在,求解惑。

by Future_Comet @ 2024-08-22 18:45:33

@giao_nice 实测:

#include<bits/stdc++.h>
using namespace std;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    int ans=10;
    ans/=5-2;
    cout<<ans;
    return 0;
}

输出3

by giao_nice @ 2024-08-22 21:14:40

@Future_Comet 哦，我记错了，是ans=ans/5-2才会出问题。