洛谷告诉我今天宜切水题..............

RockyQ012 @ 2024-07-11 20:08:38

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    int a[n];
    cin >> n;
    int ans = 0;  
    for(int i = 1 ; i <= n ; ++i) cin >> a[i];
    sort(a + 1 , a + n + 1);
    for(int i = 2 ; i <= n - 1 ; ++i) {
        ans += a[i];
    }
    double sum = ans / (n - 2);
    cout << fixed << setprecision(2) << sum;
    return 0;
}

by 残阳如血 @ 2024-07-11 20:09:31

@RockyQ012 你这数组怎么开的

by RockyQ012 @ 2024-07-11 20:11:21

不可以这么开吗？

by qiuribomu @ 2024-07-11 20:12:05

@RockyQ012 那也需要在输入数据后

by RockyQ012 @ 2024-07-11 20:14:31

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    int ans = 0; 
    int a[n];
    for(int i = 1 ; i <= n ; ++i) cin >> a[i];
    sort(a + 1 , a + n + 1);
    for(int i = 2 ; i <= n - 1 ; ++i) {
        ans += a[i];
    }
    double sum = ans / (n - 2);
    cout << fixed << setprecision(2) << sum;
    return 0;
}

还是不对

by WEICY123 @ 2024-07-11 20:16:13

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    int a[1000001];
    cin >> n;
    double ans = 0;  
    for(int i = 1 ; i <= n ; ++i) cin >> a[i];
    sort(a + 1 , a + n + 1);
    for(int i = 2 ; i <= n - 1 ; ++i) {
        ans += a[i];
    }
    double sum = ans / (n - 2);
    cout << fixed << setprecision(2) << sum;
    return 0;
}

@RockyQ012 n在此题中是变量。数组const int n才能用a[n],ans要用double类型的

by dino @ 2024-07-11 20:16:48

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    int a[n + 1];
    int ans = 0;  
    for(int i = 1 ; i <= n ; ++i) cin >> a[i];
    sort(a + 1 , a + n + 1);
    for(int i = 2 ; i <= n - 1 ; ++i) {
        ans += a[i];
    }
    double sum = ans / ((n - 2) * 1.0);
    cout << fixed << setprecision(2) << sum;
    return 0;
}

@RockyQ012

by STA_Morlin @ 2024-07-11 20:17:32

@qiuribomu 不可以。

by sshhgggddsbf @ 2024-07-11 20:17:45

int a[n]放cin后面，且ans开double

by dino @ 2024-07-11 20:19:01

@RockyQ012 a[n]下标0~n-1,需要加个1。然后除法和/前后变量类型有关，你这里都为int，不能进行小数运算，要*1.0

by qiuribomu @ 2024-07-11 20:19:23

@STA_Morlin 可以啊，输入后就有数据了，可以使用输入的值去开数组