题解

对半分，循环输入要从1开始，不然对半分会出问题

#include<bits/stdc++.h>
using namespace std;
int a[105];
void f(int l,int r){
    if(l==r){
        return ;
    }
    int mid=(l+r)/2;
    cout<<"[";
    for(int i = l;i<=mid;i++){
        cout<<a[i]<<" ";
    }
    cout<<"],";
    cout<<"[";
    for(int i = mid+1;i<=r;i++){
        cout<<a[i]<<" ";
    }
    cout<<"]\n";
    f(l,mid);
    f(mid+1,r);
}
int main(){
    int n;
    cin>>n;
    for(int i = 1;i<=n;i++){
        cin>>a[i];
    }
    f(1,n);
    return 0;
}