C++ 代码

#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<algorithm>
using namespace std;
typedef long long LL;
const int N = 1e5 + 10;
LL a[N],b[N];
LL n;
LL ans;
int main() {
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i];
    for(int i=1;i<=(n+1)/2;i++){
        if(a[i]<a[n-i+1])b[i]=a[n-i+1]-a[i];
        else b[n-i+1]=a[i]-a[n-i+1];
    }
    for(int i=1;i<=n;i++){
        int minn=min(b[i],b[i+1]);
        b[i]-=minn;
        b[i+1]-=minn;
        ans+=minn;
        ans+=b[i];
    }
    cout<<ans;
    return 0;
}